Management server and vehicle

Abstract

A management server (70) manages registration of a plurality of digital keys to a vehicle (20). The management server (70) communicates with the vehicle (20) and a plurality of devices (30). The vehicle (20) stores key-related information, which is information relating to each of the plurality of digital keys. Each of the plurality of devices stores information indicating at least one of the plurality of digital keys. The management server (70) calculates a difference (DF) between the maximum number of digital keys that can be registered to the vehicle (20) and the number pieces of key-related information stored in the vehicle (20). When the difference (DF) is equal to or less than a prescribed number (PN), the management server (70) transmits, to an owner device (40) belonging to the owner of the vehicle (20), a shortage notification (M81) indicating that the difference (DF) is equal to or less than the prescribed number (PN).

Description

Management server, vehicle

[0001] The present disclosure relates to a management server and a vehicle.

[0002] Patent Document 1 describes a management system. The management system includes a vehicle, multiple devices, and a management server. When registering a digital key, the vehicle stores authentication information for authenticating the digital key. When registering a digital key, the device stores key information indicating the digital key. The management server is capable of communicating with the devices and the vehicle. The management server manages the registration of the digital key.

[0003] JP 2024-1720 A

[0004] There are two types of digital keys that can be registered to a device. The first is an owner key, which is registered to an owner device belonging to the vehicle owner. The second is a shared key, which is registered to a device other than the owner device upon request from one of the multiple devices included in the management system. The device that stores the key information of the shared key is the shared device. In the management system, the owner device and the shared device can request the registration of a new shared key.

[0005] In the management system, there is a limit to the number of authentication information that a vehicle can store. As mentioned above, the shared key is registered not only by the owner device but also by request from the shared device. Therefore, there is a risk that the number of authentication information stored in the vehicle will reach the limit without the vehicle owner realizing it.

[0006] In a first aspect of the present disclosure, a management server is configured to manage the registration of multiple digital keys for a vehicle. The management server includes a communication module configured to communicate with the vehicle and multiple devices, and an execution device configured to control the communication module. The vehicle is configured to store key-related information relating to each of the multiple digital keys. Each of the multiple devices is configured to store information indicating at least one of the multiple digital keys. The multiple devices include an owner device that belongs to the owner of the vehicle. The execution device is configured to calculate a difference between the maximum number of digital keys that can be registered to the vehicle and the number of pieces of key-related information stored in the vehicle, and, when the difference becomes equal to or less than a predetermined number, control the communication module to send a shortage notification to the owner device indicating that the difference is equal to or less than the predetermined number.

[0007] In a second aspect of the present disclosure, a management server is configured to manage the registration of multiple digital keys for a vehicle. The management server includes a communication module configured to communicate with the vehicle and multiple devices, and an execution device configured to control the communication module. The vehicle is configured to store key-related information relating to each of the multiple digital keys. Each of the multiple devices is configured to store information indicating at least one of the multiple digital keys. The execution device is configured to calculate a difference between the maximum number of digital keys that can be registered for the vehicle and the number of pieces of key-related information stored in the vehicle, and, when the difference is equal to or less than a predetermined number, control the communication module to send a shortage notification to a display device provided in the vehicle, indicating that the difference is equal to or less than the predetermined number.

[0008] In a third aspect of the present disclosure, a vehicle is configured to communicate with multiple devices and a management server. The vehicle includes a communication module, a storage device configured to store key-related information relating to each of multiple digital keys that can be registered to the vehicle, and an execution device configured to control the communication module. The management server is configured to manage the registration of the multiple digital keys. Each of the multiple devices is configured to store information indicating at least one of the multiple digital keys. The multiple devices include an owner device that belongs to the owner of the vehicle. The execution device calculates the difference between the maximum number of digital keys that can be registered to the vehicle and the number of pieces of key-related information stored in the storage device, and when the difference becomes equal to or less than a predetermined number, controls the communication module to send a shortage notification to the owner device indicating that the difference is equal to or less than the predetermined number.

[0009] In a fourth aspect of the present disclosure, a vehicle is configured to communicate with multiple devices and a management server. The vehicle includes a display device, a storage device configured to store key-related information relating to each of multiple digital keys that can be registered to the vehicle, and an execution device. The management server is configured to manage the registration of the multiple digital keys. Each of the multiple devices is configured to store information indicating at least one of the multiple digital keys. The execution device is configured to calculate a difference between the maximum number of digital keys that can be registered to the vehicle and the number of pieces of key-related information stored in the storage device, and, when the difference is equal to or less than a predetermined number, display a message on the display device indicating that the difference is equal to or less than the predetermined number.

[0010] FIG. 1 is a schematic diagram showing a management system of a first embodiment. FIG. 2 is a schematic diagram showing owner key information stored in an owner device of FIG. 1. FIG. 3 is a schematic diagram showing share key information stored in a share device of FIG. 1. FIG. 4 is a schematic diagram showing data in the database of FIG. 1. FIG. 5 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when an owner key is registered. FIG. 6 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a friend key is registered. FIG. 7 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a non-friend key is registered. FIG. 8 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a non-friend key is deleted in response to a request from a friend device. FIG. 9 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a non-friend key is deleted in response to a request from a non-friend device. FIG. 10 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a friend key is deleted in response to a request from an owner device. FIG. 11 is an explanatory diagram showing a series of processes performed by the management system of FIG. 1 when a friend key is deleted in response to a request from a friend device. FIG. 12 is an explanatory diagram showing a series of processes executed by the management system of FIG. 1 after a digital key has been registered. FIG. 13 is an explanatory diagram showing a series of processes executed by the management system of FIG. 1 after a digital key has been deleted. FIG. 14 is a schematic diagram showing a vehicle in a management system of a second embodiment. FIG. 15 is an explanatory diagram showing a series of processes executed by the management system of the second embodiment after a digital key has been registered. FIG. 16 is an explanatory diagram showing a series of processes executed by the management system of the second embodiment after a digital key has been deleted. FIG. 17 is an explanatory diagram showing a series of processes executed by the management system of a third embodiment after a digital key has been registered. FIG. 18 is an explanatory diagram showing a series of processes executed by the management system of the third embodiment after a digital key has been deleted. FIG. 19 is an explanatory diagram showing a series of processes executed by the management system of a fourth embodiment after a digital key has been registered. FIG. 20 is an explanatory diagram showing a series of processes executed by the management system of the fourth embodiment after a digital key has been deleted.

[0011] First Embodiment A first embodiment of a management system will be described below with reference to the drawings. <Outline of Management System 10> As shown in FIG. 1 , the management system 10 manages multiple digital keys that can be used for a vehicle 20. There is a standard for digital keys established by the Car Connectivity Consortium (CCC). Matters related to the digital keys in this embodiment comply with the CCC. The management system 10 includes a vehicle 20, multiple devices 30, a device server 60, and a management server 70.

[0012] The vehicle 20 includes a communication module 21, an HMI 22, a BLE module 23, a UWB module 24, an NFC module 25, and a vehicle management device 26. HMI stands for Human Machine Interface. BLE stands for Bluetooth Low Energy. UWB stands for Ultra Wide Band. NFC stands for Near Field Communication.

[0013] The communication module 21 communicates with the management server 70 via a wireless communication network. The HMI 22 includes an input device that accepts operations by the user of the vehicle 20 and a presentation device that presents information to the user using images, audio, etc. The presentation device is, for example, a monitor and a speaker. In the vehicle 20, the HMI 22 is a display device.

[0014] The BLE module 23 performs short-range wireless communication with the device 30 via BLE communication. The one or more UWB modules 24 communicate with the device 30 via UWB communication. The one or more UWB modules 24 measure the distance between the device 30 and the vehicle 20. The NFC module 25 performs short-range wireless communication with the device 30 via NFC communication.

[0015] The vehicle management device 26 is mounted on the vehicle 20. The vehicle management device 26 manages the digital key of the vehicle 20. The vehicle management device 26 is, for example, a digital key ECU. The vehicle management device 26 has an execution device 27, which is a processing circuit, and a storage device 28. The storage device 28 stores a vehicle program PV and authentication information AT. The execution device 27 executes the vehicle program PV, causing the execution device 27 to store and delete the authentication information AT. The authentication information AT is information for authenticating the digital key so that the vehicle 20 can be controlled using the digital key when the digital key is used. The authentication information AT is provided for each digital key to be authenticated. The execution device 27 is a CPU. The execution device 27 executes the vehicle program PV to perform processing related to the storage and deletion of the authentication information AT. The execution device 27 controls the communication module 21. The execution device 27 controls the HMI 22.

[0016] When the vehicle management device 26 authenticates the digital key, the vehicle management device 26 allows the digital key to be used to control the vehicle 20. For example, when the vehicle management device 26 authenticates the digital key, the vehicle management device 26 allows the vehicle 20 to be unlocked. Also, for example, when the vehicle management device 26 authenticates the digital key, the vehicle management device 26 allows the vehicle 20 to be started.

[0017] The device 30 is a mobile information terminal such as a smartphone, and includes a communication module 31, an HMI 32, a BLE module 33, a UWB module 34, an NFC module 35, an execution unit 36 ​​which is a processing circuit, and a storage unit 37.

[0018] The communication module 31 communicates with the device server 60 via a wireless communication line. The HMI 32 includes an input device that accepts operations by the user of the device 30, and a presentation device that presents information to the user using images, audio, etc. The presentation device is, for example, a monitor and a speaker.

[0019] The BLE module 33 performs short-range wireless communication with the vehicle 20 using BLE communication. The UWB module 34 communicates with the vehicle 20 using UWB communication. The NFC module 35 performs short-range communication with the vehicle 20 using NFC communication.

[0020] The storage device 37 stores a device program PD and key information DK. The device program PD is executed by the execution device 36, causing the execution device 36 to store and delete the key information DK. The key information DK is information indicating a digital key.

[0021] The device program PD includes, for example, a device application and a digital key framework. The device application is an application for storing and deleting key information DK. The digital key framework is a program that provides functions for pairing devices 30 and sharing digital keys using APIs provided by the OS. The execution unit 36 ​​executes the device program PD to perform processes related to storing and deleting key information DK.

[0022] The multiple devices 30 include an owner device 40 and multiple shared devices 50. The owner device 40 stores owner key information DKO indicating an owner key KO as key information DK. Only one owner key KO can be registered to one vehicle 20. Therefore, only one owner key KO exists for one vehicle 20. The owner device 40 belongs to the owner of the vehicle 20.

[0023] 2, the owner key information DKO includes owner key structure information STO. The owner key structure information STO includes vehicle identification information ST1, in-device key identification information ST2, digital key identification information ST3, and slot identification information ST4. The owner key structure information STO also includes certificate information ST5, device public key information ST6, vehicle public key information ST7, and permission public key information ST8.

[0024] The vehicle identification information ST1 is information for identifying the vehicle 20 for which the digital key is to be set. For example, it is the ID of the vehicle 20. The in-device key identification information ST2 is used for managing the digital key within the device 30. The in-device key identification information ST2 is information that can identify the digital key within the application of the device 30.

[0025] The digital key identification information ST3 is used for managing the digital key in the management server 70. The slot identification information ST4 is information that can identify the digital key locally on the device 30.

[0026] Certificate information ST5 indicates a certificate that certifies the digital key. Device public key information ST6 indicates a device public key PKD that is the public key of the device 30. The device public key PKD in the owner key information DKO indicates the public key of the owner device 40. Vehicle public key information ST7 indicates a vehicle public key PKV that is the public key of the vehicle 20. Authorization public key information ST8 indicates an already authorized vehicle public key PKV.

[0027] As shown in Fig. 1, the share device 50 stores share key information DKS indicating a share key KS as key information DK. The share device 50 is a device 30 separate from the owner device 40. The share key KS is a digital key that can be registered in multiple numbers for one vehicle 20 in order to enable the use of the digital key. In other words, multiple share keys KS can exist for one vehicle 20.

[0028] The multiple share devices 50 include a friend device 51 and a non-friend device 52. The friend device 51 stores, as the share key information DKS, friend key information DKF indicating a friend key KF. The non-friend device 52 stores, as the share key information DKS, non-friend key information DKN indicating a non-friend key KN. In other words, the types of share keys KS include a friend key KF and a non-friend key KN. The friend key KF is a share key KS registered based on a registration request D21 directly from the owner device 40, as described below. The non-friend key KN is a share key KS registered based on a registration request D31 from the friend device 51, as described below. In other words, the non-friend key KN is a share key KS registered based on a registration request D31 from another device 30, rather than a registration request D21 directly from the owner device 40. The non-friend key KN is a share key KS that is not a friend key KF.

[0029] When a digital key is registered, the digital key is enabled for use, i.e., when the digital key is registered, the vehicle 20 stores the authentication information AT and the device 30 stores the key information DK.

[0030] There is an upper limit to the amount of authentication information AT that the vehicle 20 can store. In the management system 10, there is a maximum number of digital keys that can be registered for the vehicle 20. As shown in FIG. 3 , the shared key information DKS includes shared key structure information STS and an authentication package ATP. The shared key structure information STS includes vehicle identification information ST1, intra-device key identification information ST2, digital key identification information ST3, and slot identification information ST4. The shared key structure information STS includes certificate information ST5, vehicle public key information ST7, and authorization public key information ST8. In other words, the shared key structure information STS is the owner key structure information STO minus the device public key information ST6.

[0031] The authentication package ATP includes signature information ATP1, password information ATP2, validity start time information ATP3, expiration date information ATP4, name information ATP5, and device public key information ATP6.

[0032] The signature information ATP1 indicates that the share device 50 is a legitimate target for sharing a digital key. For example, in the case of the friend device 51, the signature information ATP1 indicates a signature by the owner device 40. The owner signature information indicates that the owner device 40 has signed the device public key PKD of the friend device 51 indicated by the device public key information ATP6. Also, for example, in the case of the non-friend device 52, the signature information ATP1 indicates a signature by the friend device 51. The friend signature information indicates that the friend device 51 has signed the device public key PKD of the non-friend device 52 indicated by the device public key information ATP6.

[0033] The password information ATP2 indicates the pairing password PAS used to establish a secure channel when pairing the vehicle 20 and the owner device 40. The validity start time information ATP3 indicates the earliest date and time at which the shared key KS can be used. The expiration date information ATP4 indicates the latest date and time at which the shared key KS can be used. The name information ATP5 indicates a name that identifies the shared key KS. The name information ATP5 is set to an identifiable name for each shared device 50, for example, by operation from the owner device 40.

[0034] As shown in FIG. 1 , the device server 60 relays communication between the devices 30 and the management server 70. Only one device server 60 is illustrated in FIG. 1 . However, a device server 60 may be provided for each type of device 30. That is, the device server 60 with which a first type of device 30 communicates may be different from the device server 60 with which a second type of device 30 communicates. For example, the type refers to the model of the device 30, and a device server 60 is provided for each model of the device 30. For example, the type refers to the communication line used by the device 30, and a device server 60 is provided for each communication line used by the device 30.

[0035] Each device server 60 relays communication between the corresponding device 30 and the management server 70. Different types of devices 30 can communicate with the management server 70 via the corresponding device server 60.

[0036] <Management Server 70> The management server 70 is configured to manage the registration of digital keys. The management server 70 is capable of communicating with the vehicle 20 and multiple devices 30. The management server 70 includes an execution device 71, which is a processing circuit, a storage device 72, and a communication module 73. The communication module 73 communicates with the device server 60 via a wireless communication line. The communication module 73 is also capable of wireless communication with the communication module 21 of the vehicle 20. The execution device 71 controls the communication module 73.

[0037] The storage device 72 stores a server program PS, a counting program PC, and a database DB. The server program PS, when executed by the execution device 71, causes the execution device 71 to register and delete digital keys in the database DB.

[0038] The count program PC is executed by the execution device 71, causing the execution device 71 to count the number of pieces of authentication information AT stored in the vehicle 20. The count program PC is executed by the execution device 71, causing the execution device 71 to perform control according to the number of pieces of authentication information AT stored in the vehicle 20.

[0039] The database DB contains information associating, for each of a plurality of digital keys, the corresponding vehicle 20 with the registered device 30. The data DA contained in the database DB is separated for each vehicle 20. When a digital key is registered, the management server 70 stores, as the data DA, information indicating the device 30 that stores the key information DK indicating the digital key. The management server 70 manages the digital keys by saving the data DA in the database DB.

[0040] As shown in Figure 4, the data DA for one vehicle 20 includes information about the type of digital key registered to the vehicle 20, the registered devices 30, and the relationships between the registered devices 30. Digital keys are divided into multiple hierarchies based on their type. From top to bottom, the hierarchy is divided into owner keys KO, friend keys KF, and non-friend keys KN. The higher the hierarchy, the greater the authority set for the digital key.

[0041] The authority may be, for example, the number of share keys KS that can be requested to be registered, the range of control of the vehicle 20 that can be achieved by authenticating the digital key, etc. The higher the hierarchical level of the digital key, the greater the number of share keys KS that can be requested to be registered. More specifically, for example, the number of friend keys KF that the owner device 40 can request to be registered is greater than the number of non-friend keys KN that the friend device 51 can request to be registered.

[0042] Furthermore, for example, the higher the hierarchical level of a digital key, the wider the controllable range of the vehicle 20. The controllable range of the vehicle 20 indicates, for example, the possible controls among control of starting the engine of the vehicle 20, control of turning on the power of the vehicle 20, and control of unlocking and locking the doors of the vehicle 20. For example, if the controllable range of the vehicle 20 includes the above-mentioned three controls, the controllable range of the vehicle 20 is wider than if the controllable range of the vehicle 20 is only control of unlocking and locking the doors of the vehicle 20. More specifically, the controllable range of the vehicle 20 that can be controlled by the friend key KF is the above-mentioned three controls, while the controllable range of the vehicle 20 that can be controlled by the non-friend key KN is only control of unlocking and locking the doors of the vehicle 20.

[0043] The following describes a state in which digital keys are registered to seven devices 30 for one vehicle 20. The seven devices 30 are a first device 30A to a seventh device 30G. The digital keys registered to the first device 30A to the seventh device 30G are the first digital key to the seventh digital key, respectively.

[0044] The device 30 in which the owner key KO is registered as a digital key is the first device 30A. That is, the first device 30A is the owner device 40. That is, the first digital key is the owner key KO.

[0045] The devices 30 in which the shared key KS is registered as a digital key are the second device 30B, the third device 30C, the fourth device 30D, the fifth device 30E, the sixth device 30F, and the seventh device 30G. That is, the second device 30B, the third device 30C, the fourth device 30D, the fifth device 30E, the sixth device 30F, and the seventh device 30G are shared devices 50. That is, the second digital key to the seventh digital key are all shared keys KS.

[0046] More specifically, the devices 30 in which the friend key KF is registered as the share key KS are the second device 30B and the fifth device 30E. That is, the second device 30B and the fifth device 30E are friend devices 51. The devices 30 in which the non-friend key KN is registered as the share key KS are the third device 30C, the fourth device 30D, the sixth device 30F, and the seventh device 30G. That is, the fourth device 30D, the fifth device 30E, the sixth device 30F, and the seventh device 30G are non-friend devices 52.

[0047] The relationship between the registered devices 30 contained in the data DA will be described. The relationship between the second device 30B and the first device 30A is such that the friend key KF is registered in the second device 30B based on a registration request from the first device 30A. In other words, the second digital key is registered based on the first digital key.

[0048] The relationship between the fifth device 30E and the first device 30A is such that the friend key KF is registered in the fifth device 30E based on a registration request from the first device 30A. In other words, the fifth digital key is registered based on the first digital key.

[0049] The relationship between the third device 30C and the second device 30B is such that the non-friend key KN is registered in the third device 30C based on a registration request from the second device 30B. In other words, the third digital key is registered based on the second digital key.

[0050] The relationship between the fourth device 30D and the second device 30B is such that the non-friend key KN is registered in the fourth device 30D based on a registration request from the second device 30B. In other words, the fourth digital key is registered based on the second digital key.

[0051] The relationship between the sixth device 30F and the fifth device 30E is such that the non-friend key KN is registered in the sixth device 30F based on a registration request from the fifth device 30E. In other words, the sixth digital key is registered based on the fifth digital key.

[0052] The relationship between the seventh device 30G and the fifth device 30E is such that the non-friend key KN is registered in the seventh device 30G based on a registration request from the fifth device 30E. In other words, the seventh digital key is registered based on the fifth digital key.

[0053] In this way, the data DA includes information about the device 30 to which the digital key is registered. In the data DA, the registered device 30 is associated with information indicating the device 30 that made the request that caused the registration of the device 30. The data DA also includes information indicating which digital key each digital key is registered under.

[0054] <Digital Key Registration> Next, a series of processes for registering digital keys in the management system 10 will be described. Digital key registration includes registration of the owner key KO, registration of the friend key KF, and registration of the non-friend key KN. Below, a series of processes from when each digital key is not registered to when the digital key is registered will be described. In the following explanation, the processes executed by the execution device 27 will be described as processes executed by the vehicle 20. The processes executed by the execution device 36 will be described as processes executed by the device 30. The processes executed by the execution device 71 will be described as processes executed by the management server 70.

[0055] 5, the management system 10 performs a series of processes to register the owner key KO. The following describes an example of registering the owner key KO for the first device 30A that does not store key information DK indicating the owner key KO.

[0056] By registering the owner key KO, the management system 10 causes the first device 30A to store key information DK indicating the owner key KO. By registering the owner key KO, the management system 10 causes the vehicle 20 to store authentication information AT for authenticating the owner key KO. As a result, the first device 30A is set as the owner device 40. When registering the owner key KO, necessary applications are pre-installed in the first device 30A.

[0057] When the management server 70 receives a registration request D11 for the owner key KO from the first device 30A or the like, the management server 70 first performs the process of step S11. In step S11, the management server 70 generates a pairing password PAS. Then, the management server 70 transmits information indicating the pairing password PAS to the vehicle 20 and the first device 30A.

[0058] Then, vehicle 20 receives pairing password PAS. After receiving pairing password PAS, vehicle 20 is set to pairing mode via HMI 22. Vehicle 20 waits in a state in which it can receive a password from first device 30A. Then, vehicle 20 proceeds to step S12.

[0059] In step S12, the vehicle 20 performs pairing with the first device 30A. Once pairing is performed, the vehicle 20 establishes a secure channel for data communication with the first device 30A. The pairing is performed using a pairing password PAS transmitted from the management server 70 to the vehicle 20 and the first device 30A. Once pairing is complete, the vehicle 20 proceeds to step S13.

[0060] In step S13, the vehicle 20 generates a vehicle public key PKV, which is the public key of the vehicle 20, and a vehicle private key SKV, which is the private key of the vehicle 20. Then, the vehicle 20 transmits generation data DC for generating the owner key KO to the first device 30A via the secure channel. The generation data DC includes vehicle identification information ST1 and vehicle public key information indicating the vehicle public key PKV. The first device 30A then receives the generation data DC. The first device 30A then proceeds to step S14.

[0061] In step S14, the first device 30A generates owner key information DKO indicating the owner key KO. Then, the first device 30A proceeds to step S15. In step S15, the first device 30A stores the owner key information DKO. As a result, the first device 30A becomes the owner device 40. Then, the first device 30A transmits, to the vehicle 20, certificate information ST5 related to the owner key KO and device public key information ST6 indicating the device public key PKD.

[0062] Thereafter, when vehicle 20 receives certificate information ST5 and device public key information ST6, vehicle 20 performs the process of step S16. In step S16, vehicle 20 verifies certificate information ST5. Then, when the verification of certificate information ST5 is completed, vehicle 20 proceeds to the process of step S17.

[0063] In step S17, vehicle 20 stores device public key information ST6 indicating device public key PKD as authentication information AT, and then transmits a completion notification M11 to first device 30A indicating that storage of authentication information AT has been completed.

[0064] Thereafter, when the first device 30A receives the completion notification M11, the first device 30A performs the process of step S18. In step S18, the first device 30A generates a key track request D12 for the owner key KO. The key track request D12 is a signal requesting the management server 70 to update the database DB. The first device 30A then transmits the key track request D12 for the owner key KO to the management server 70 via the device server 60.

[0065] Thereafter, when the management server 70 receives the key track request D12, it performs processing in step S19. In step S19, the management server 70 performs registration management of the owner key KO. Specifically, the management server 70 stores, as data DA of the vehicle 20 in the database DB, that the device 30 in which the owner key KO is registered is the first device 30A. This causes the management system 10 to complete the series of processes for registering the owner key KO.

[0066] 6, the management system 10 performs a series of processes to register a friend key KF. Below, an example will be described in which the series of processes is used to register a friend key KF for a second device 30B that does not store friend key information DKF.

[0067] When an operation to request registration of a friend key KF is executed in the owner device 40, the owner device 40 first performs the process of step S21. In step S21, the owner device 40 transmits a friend key KF registration request D21 to a relay server (not shown). Then, the owner device 40 proceeds to step S22.

[0068] In step S22, the owner device 40 obtains invitation information IV1 for sharing the digital key from the relay server. The invitation information IV1 is, for example, a URL link. The URL link stores share information SH1 required for sharing the digital key. The owner device 40 then transmits the invitation information IV1 to the second device 30B.

[0069] After that, when the second device 30B receives the invitation information IV1, it performs the process of step S23. In step S23, the second device 30B acquires the share information SH1 based on the invitation information IV1. Specifically, the second device 30B downloads the share information SH1 from the link source of the URL link.

[0070] The share information SH1 includes, for example, share key structure information STS, password information ATP2, validity start time information ATP3, expiration date information ATP4, and name information ATP5. The validity start time information ATP3, expiration date information ATP4, and name information ATP5 are set by the owner device 40. The second device 30B then proceeds to step S24.

[0071] In step S24, the second device 30B uses the share information SH1 to generate signature-free friend key information DKFN. The signature-free friend key information DKFN is friend key information DKF that does not include signature information ATP1. The signature-free friend key information DKFN includes the acquired share information SH1. The second device 30B then transmits to the owner device 40 a completion notification M21 indicating that the generated signature-free friend key information DKFN has been uploaded to the URL link, and a signature request D22 requesting a signature.

[0072] The owner device 40 then receives a completion notification M21 and a signature request D22 from the second device 30B. Upon receiving the completion notification M21, the owner device 40 acquires the unsigned friend key information DKFN. Upon receiving the signature request D22, the owner device 40 performs the process of step S25 in response to an operation of the owner device 40.

[0073] In step S25, the owner device 40 generates signature information ATP1. Specifically, the owner device 40 causes the HMI 32 to present the acquired signature-free friend key information DKFN and accepts an operation by the user of the owner device 40 indicating consent to the registration of the friend key KF. When this operation is performed, the owner device 40 generates signature information ATP1 based on the operation. The owner device 40 then proceeds to step S26.

[0074] In step S26, the owner device 40 adds the signature information ATP1 to the unsigned friend key information DKFN. This causes the owner device 40 to generate friend key information DKF. The owner device 40 then uploads the generated friend key information DKF to the URL link, which is the invitation information IV1. The owner device 40 then transmits a completion notification M22 to the second device 30B, indicating that the completed friend key information DKF has been uploaded to the URL link.

[0075] The second device 30B then receives the completion notification M22. The second device 30B then performs the process of step S27. In step S27, the second device 30B downloads and stores the friend key information DKF. As a result, the second device 30B is set as a friend device 51. The second device 30B then proceeds to step S28.

[0076] In step S28, the second device 30B generates a key track request D23 for the friend key KF. Then, the second device 30B transmits the friend key information DKF and the key track request D23 for the friend key KF to the management server 70.

[0077] Thereafter, when the management server 70 receives a key track request D23 for the friend key KF, the management server 70 performs the process of step S29. In step S29, the management server 70 performs registration management of the friend key KF.

[0078] Specifically, the management server 70 confirms that the friend key KF that is the target of the key track request D23 is not on the reject list. The reject list is a list that shows the share keys KS, including the friend key KF and the non-friend key KN, for which a deletion request has already been received. If the friend key KF is on the reject list, the management server 70 sends a notification to the second device 30B that it cannot comply with the key track request D23.

[0079] On the other hand, if the friend key KF that received the key track request D23 is not on the rejection list, the management server 70 registers the friend key KF that received the key track request D23 in the database DB. Specifically, the management server 70 stores, as data DA of the vehicle 20 in the database DB, that the device 30 registered as the friend device 51 is the second device 30B. The management server 70 stores the relationship between the second device 30B and the owner device 40 by referring to the acquired friend key information DKF.

[0080] Thereafter, the management server 70 transmits the authentication package ATP included in the friend key information DKF and a storage request D24 requesting storage of the authentication package ATP to the vehicle 20. That is, the management server 70 transmits device public key information ST6 indicating the device public key PKD of the friend device 51 to the vehicle 20. The management server 70 notifies the vehicle 20 that the device public key PKD has been signed by the owner device 40.

[0081] Thereafter, when the vehicle 20 receives the storage request D24 and the authentication package ATP from the management server 70, the vehicle 20 performs the process of step S30. In step S30, the vehicle 20 stores the received authentication package ATP as authentication information AT for authenticating the friend key KF.

[0082] After completing the registration management, the management server 70 transmits a key track completion notification M23 to the second device 30B. After that, upon receiving the key track completion notification M23, the second device 30B performs the processing of step S31. In the processing of step S31, the second device 30B presents information indicating the completion of the registration of the friend key KF on the HMI 32. For example, the second device 30B displays an image indicating the completion of the registration of the friend key KF on the HMI 32. This causes the management system 10 to complete the series of processes for registering the friend key KF.

[0083] 7, the management system 10 performs a series of processes to register a non-friend key KN. Below, an example will be described in which the series of processes is used to register a non-friend key KN for a third device 30C that does not store non-friend key information DKN.

[0084] When an operation to request registration of a non-friend key KN is executed on the friend device 51, the friend device 51 first performs the process of step S41. In step S41, the friend device 51 transmits a registration request D31 of the non-friend key KN to a relay server (not shown). Then, the friend device 51 proceeds to the process of step S42.

[0085] In step S42, the friend device 51 obtains invitation information IV2 for sharing the digital key from the relay server. The invitation information IV2 is, for example, a URL link. The URL link stores share information SH2 required for sharing the digital key. The friend device 51 then transmits the invitation information IV2 to the third device 30C.

[0086] After that, when the third device 30C receives the invitation information IV2, it performs the process of step S43. In step S43, the third device 30C acquires the share information SH2 based on the invitation information IV2. Specifically, the third device 30C downloads the share information SH2 from the URL link.

[0087] The share information SH2 includes, for example, share key structure information STS, password information ATP2, validity start time information ATP3, expiration date information ATP4, and name information ATP5. The validity start time information ATP3, expiration date information ATP4, and name information ATP5 are set by the friend device 51. The third device 30C then proceeds to step S44.

[0088] In step S44, the third device 30C uses the share information SH2 to generate unsigned non-friend key information DKNN. The unsigned non-friend key information DKNN is non-friend key information DKN that does not have the signature information ATP1. The unsigned non-friend key information DKNN includes the acquired share information SH2. The third device 30C then transmits to the friend device 51 a completion notification M31 indicating that the generated unsigned non-friend key information DKNN has been uploaded to the URL link, and a signature request D32 requesting a signature.

[0089] The friend device 51 then receives a completion notification M31 and a signature request D32 from the third device 30C. Upon receiving the completion notification M31, the friend device 51 acquires the unsigned non-friend key information DKNN. Upon receiving the signature request D32, the friend device 51 performs the process of step S45 in response to an operation of the friend device 51.

[0090] In step S45, the friend device 51 generates signature information ATP1. Specifically, the friend device 51 causes the HMI 32 to present the acquired signature-less non-friend key information DKNN, and accepts an operation by the user of the friend device 51 indicating consent to the generation of the non-friend key KN. When the operation is performed, the friend device 51 generates signature information ATP1 based on the operation. The friend device 51 then proceeds to step S46.

[0091] In step S46, the friend device 51 adds the signature information ATP1 to the unsigned non-friend key information DKNN. This causes the friend device 51 to generate non-friend key information DKN. The friend device 51 then uploads the generated non-friend key information DKN to the URL link, which is the invitation information IV2. The friend device 51 then transmits a completion notification M32 to the third device 30C, indicating that the completed non-friend key information DKN has been uploaded to the URL link.

[0092] The third device 30C then receives the completion notification M32. The third device 30C then performs the process of step S47. In step S47, the third device 30C downloads and stores the non-friend key information DKN. As a result, the third device 30C is set as a non-friend device 52. The third device 30C then proceeds to step S48.

[0093] In step S48, the third device 30C generates a key track request D33 for the non-friend key KN. Then, the third device 30C transmits the non-friend key information DKN and the key track request D33 for the non-friend key KN to the management server 70.

[0094] Thereafter, when the management server 70 receives a key track request D33 for the non-friend key KN, the management server 70 performs the process of step S49. In step S49, the management server 70 performs registration management of the non-friend key KN.

[0095] Specifically, the management server 70 confirms that the non-friend key KN that is the target of the key track request D33 is not on the rejection list. If the non-friend key KN is on the rejection list, the management server 70 sends a notification to the third device 30C that the key track request D33 cannot be fulfilled.

[0096] On the other hand, if the non-friend key KN is not on the rejection list, the management server 70 registers the non-friend key KN that is the target of the key track request D33 in the database DB. Specifically, the management server 70 stores, as data DA of the vehicle 20 in the database DB, that the device 30 registered as the non-friend device 52 is the third device 30C. The management server 70 stores the relationship between the third device 30C and the friend device 51 by referring to the acquired non-friend key information DKN. Specifically, the management server 70 stores that the third device 30C is the device 30 having the non-friend key KN registered in response to the registration request D31 from the friend device 51.

[0097] Thereafter, the management server 70 transmits the authentication package ATP included in the non-friend key information DKN and a storage request D34 requesting storage of the authentication package ATP to the vehicle 20. That is, the management server 70 transmits device public key information ST6 indicating the device public key PKD of the non-friend device 52 to the vehicle 20. The management server 70 notifies the vehicle 20 that the device public key PKD is signed by the friend device 51.

[0098] Thereafter, when the vehicle 20 receives the authentication package ATP and the storage request D34, the vehicle 20 performs the process of step S50. In step S50, the vehicle 20 stores the received authentication package ATP. The authentication package ATP is authentication information AT for authenticating the non-friend key KN.

[0099] After completing the registration management, the management server 70 transmits a key track completion notification M33 to the third device 30C. After that, upon receiving the key track completion notification M33, the third device 30C performs the process of step S51. In the process of step S51, the third device 30C presents information indicating the completion of registration of the non-friend key KN to the HMI 32. For example, the third device 30C displays an image indicating the completion of registration of the non-friend key KN on the HMI 32. This causes the management system 10 to complete the series of processes for registering the non-friend key KN.

[0100] <Deleting a non-friend key KN> Next, a series of processes for deleting a non-friend key KN in the management system 10 will be described. Below, a series of flows from a state in which a non-friend key KN is registered to a state in which the non-friend key KN is not registered will be described. In the following explanation, the process executed by the execution device 27 will be described as a process executed by the vehicle 20. The process executed by the execution device 36 will be described as a process executed by the device 30. The process executed by the execution device 71 will be described as a process executed by the management server 70.

[0101] <Deletion of Non-Friend Key KN in Response to Request from Friend Device 51> As shown in FIG. 8, the management system 10 performs a series of processes to delete the non-friend key KN in response to a deletion reservation request D41 from the friend device 51.

[0102] When an operation to request the deletion of the non-friend key KN is executed in the friend device 51, the friend device 51 first performs the process of step S61. In step S61, a deletion reservation request D41 for the non-friend key KN is generated. The deletion reservation request D41 is a signal requesting the deletion of the non-friend key KN when a specified condition RC, which will be described later, is satisfied.

[0103] The deletion reservation request D41 includes a signal requesting deletion of the non-friend key KN, digital key identification information ST3 indicating the non-friend key KN, and information indicating a prescribed condition RC. The prescribed condition RC is a condition required for the management server 70 to start deletion after receiving the deletion reservation request D41. The prescribed condition RC is determined in advance. For example, the prescribed condition RC is that a predetermined fade-out period has elapsed since the deletion reservation request D41 was received. Then, the friend device 51 transmits the deletion reservation request D41 for the non-friend key KN to the management server 70.

[0104] Thereafter, when the management server 70 receives the deletion reservation request D41 for the non-friend key KN, it performs processing in step S62. In step S62, the management server 70 generates a deletion pending notification M41 indicating that deletion is pending in accordance with the deletion reservation request D41. Then, the management server 70 transmits the deletion pending notification M41 to the friend device 51.

[0105] Thereafter, when the friend device 51 receives the deletion pending notification M41, the friend device 51 performs the process of step S63. In step S63, the friend device 51 presents to the HMI 32 information indicating that the non-friend key KN that is the subject of the deletion reservation request D41 is on deletion pending and will be deleted as soon as the specified condition RC is satisfied.

[0106] After the process of step S62, the management server 70 performs the process of step S64. In step S64, the management server 70 sets the state of the non-friend key KN that is the target of the deletion reservation request D41 to the fade-out state in the database DB. The fade-out state is a state in which the deletion reservation request D41 has been received but the execution of deletion is still pending. Then, the management server 70 proceeds to the process of step S65.

[0107] In step S65, the management server 70 confirms that the prescribed condition RC is satisfied. If the management server 70 confirms that the prescribed condition RC is satisfied, the management server 70 proceeds to step S66.

[0108] In step S66, the management server 70 generates a deletion request D42 requesting the deletion of the non-friend key information DKN indicating the non-friend key KN that is the target of the deletion reservation request D41. Then, the management server 70 transmits the deletion request D42 to the non-friend device 52.

[0109] Thereafter, when the non-friend device 52 receives the deletion request D42, it performs processing in step S67. In step S67, the non-friend device 52 deletes the non-friend key information DKN in accordance with the deletion request D42. Then, the non-friend device 52 transmits a deletion completion notification M42 to the management server 70, indicating that the deletion in accordance with the deletion request D42 has been completed.

[0110] Thereafter, when the management server 70 receives the completion notification M42, the management server 70 performs the process of step S68. In step S68, the management server 70 stores the history of the deletion of the non-friend key information DKN in the non-friend device 52. Thereafter, the management server 70 proceeds to the process of step S69.

[0111] In step S69, the management server 70 generates a deletion request D43 for the authentication information AT. The deletion request D43 for the authentication information AT indicates a request to delete the authentication information AT for authenticating the non-friend key KN that is the target of the deletion reservation request D41. The management server 70 then transmits the deletion request D43 to the vehicle 20.

[0112] Thereafter, when the vehicle 20 receives the deletion request D43, the vehicle 20 performs the processing of step S70. In step S70, the vehicle 20 deletes the authentication information AT for authenticating the non-friend key KN that is the subject of the deletion reservation request D41 in accordance with the deletion request D43. That is, the vehicle 20 deletes the authentication package ATP of the non-friend key KN. The vehicle 20 then transmits a completion notification M43 to the management server 70 indicating that the deletion of the authentication information AT in accordance with the deletion request D43 has been completed.

[0113] Thereafter, when the management server 70 receives the completion notification M43, the management server 70 performs the process of step S71. In step S71, the management server 70 stores the deletion history of the authentication information AT for authenticating the non-friend key KN to be deleted in the current series of deletion-related processes. Then, the management server 70 proceeds to the process of step S72.

[0114] In step S72, the management server 70 updates the database DB. Specifically, the management server 70 deletes the non-friend device 52 having the non-friend key KN to be deleted in this series of processes from the data DA of the vehicle 20 in the database DB. Thereafter, the management server 70 transmits a completion notification M44 to the friend device 51, indicating that the series of deletions of the non-friend key KN in accordance with the deletion reservation request D41 has been completed.

[0115] Thereafter, when the friend device 51 receives the completion notification M44, the friend device 51 performs the process of step S73. In step S73, the friend device 51 presents, to the HMI 32, information indicating that the deletion of the non-friend key KN, which is the subject of the deletion reservation request D41, has been completed. For example, the friend device 51 displays, on the HMI 32, an image indicating that the deletion of the non-friend key KN has been completed. Thereafter, the management system 10 ends the series of processes for the deletion of the current non-friend key KN.

[0116] <Deletion of a non-friend key KN due to a deletion operation on a non-friend device 52> As shown in Figure 9, the management system 10 performs a series of processes to delete a non-friend key KN indicated by the non-friend key information DKN stored in the non-friend device 52 due to a deletion operation on the non-friend device 52.

[0117] When a predetermined operation requesting the deletion of the non-friend key KN is executed in the non-friend device 52, the non-friend device 52 first performs the processing of step S81. In step S81, the non-friend device 52 deletes the non-friend key information DKN in accordance with the predetermined operation. Thereafter, the non-friend device 52 transmits a completion notification M51 indicating that the deletion of the non-friend key information DKN has been completed to the management server 70.

[0118] Thereafter, when the management server 70 receives the completion notification M51, the management server 70 performs the process of step S82. In step S82, the management server 70 stores the history of the deletion of the non-friend key information DKN in the non-friend device 52. Thereafter, the management server 70 transmits a completion notification M52 to the friend device 51, indicating that the deletion of the non-friend key information DKN has been completed.

[0119] Thereafter, when the friend device 51 receives the completion notification M52, the friend device 51 performs the process of step S83. In step S83, the friend device 51 presents, to the HMI 32, information indicating that the deletion of the non-friend key information DKN of the non-friend device 52 has been completed. For example, the friend device 51 displays, on the HMI 32, an image indicating that the deletion of the non-friend key KN has been completed.

[0120] After the process of step S82, the management server 70 performs the process of step S84. In step S84, the management server 70 generates a deletion request D51 requesting the deletion of the authentication information AT for authenticating the non-friend key information DKN that was deleted in step S81. The management server 70 then transmits the deletion request D51 to the vehicle 20.

[0121] Thereafter, when the vehicle 20 receives the deletion request D51, the vehicle 20 performs the process of step S85. In step S85, the vehicle 20 deletes the authentication information AT for authenticating the non-friend key information DKN that was deleted in step S81 in accordance with the deletion request D51. The vehicle 20 then transmits a completion notification M53 to the management server 70 indicating that the deletion of the authentication information AT in accordance with the deletion request D51 has been completed.

[0122] Thereafter, when the management server 70 receives the completion notification M53, the management server 70 performs the process of step S86. In step S86, the management server 70 stores the history of the deletion of the authentication information AT for authenticating the non-friend key information DKN that was completely deleted in step S81. Thereafter, the management server 70 proceeds to the process of step S87.

[0123] In step S87, the management server 70 updates the database DB. Specifically, the management server 70 deletes the non-friend device 52 having the non-friend key KN to be deleted in this series of processes from the data DA of the vehicle 20 in the database DB. This causes the management system 10 to end the series of processes for deleting the non-friend key KN.

[0124] <Deleting a Friend Key KF> Next, a series of processes for deleting a friend key KF in the management system 10 will be described. Below, a series of flows from a state in which a friend key KF is registered to a state in which a friend key KF is not registered will be described. In the following explanation, the process executed by the execution device 27 will be described as a process executed by the vehicle 20. The process executed by the execution device 36 will be described as a process executed by the device 30. The process executed by the execution device 71 will be described as a process executed by the management server 70.

[0125] <Deleting the Friend Key KF in Response to a Request from the Owner Device 40> As shown in FIG. 10, the management system 10 performs a series of processes to delete the friend key KF in response to a deletion reservation request D61 from the owner device 40.

[0126] When an operation to request the deletion of the friend key KF is executed in the owner device 40, the owner device 40 first performs the process of step S91. In step S91, a deletion reservation request D61 for the friend key KF is generated. The deletion reservation request D61 is a request for a deletion reservation. The deletion reservation request D61 is a signal requesting the deletion of the friend key KF when a specified condition RC, which will be described later, is satisfied.

[0127] The deletion reservation request D61 includes a signal requesting deletion of the friend key KF, digital key identification information ST3 indicating the friend key KF, and information indicating a prescribed condition RC. The prescribed condition RC is a condition required for the management server 70 to start deletion after receiving the deletion reservation request D61. The prescribed condition RC is determined in advance. For example, the prescribed condition RC is that a predetermined fade-out period has elapsed since the deletion reservation request D61 was received. Then, the owner device 40 transmits the deletion reservation request D61 for the friend key KF to the management server 70.

[0128] Thereafter, upon receiving the deletion reservation request D61 for the friend key KF, the management server 70 performs processing in step S92. In step S92, the management server 70 generates a deletion pending notification M61 indicating that deletion is pending in accordance with the deletion reservation request D61. The management server 70 then transmits the deletion pending notification M61 to the owner device 40.

[0129] Thereafter, when the owner device 40 receives the deletion pending notification M61, the owner device 40 performs the process of step S93. In step S93, the owner device 40 presents to the HMI 32 information indicating that the friend key KF that is the subject of the deletion reservation request D61 is on deletion pending and will be deleted as soon as the specified condition RC is satisfied.

[0130] After the process of step S92, the management server 70 performs the process of step S94. In step S94, the management server 70 sets the state of the friend key KF that is the target of the deletion reservation request D61 to the fade-out state in the database DB. The fade-out state is a state in which the deletion reservation request D61 has been received but the execution of deletion is still pending. The management server 70 then proceeds to the process of step S95.

[0131] In step S95, the management server 70 confirms that the prescribed condition RC is satisfied. If the management server 70 confirms that the prescribed condition RC is satisfied, the management server 70 proceeds to step S96.

[0132] In step S96, the management server 70 generates a deletion request D62 requesting the deletion of the friend key information DKF indicating the friend key KF that is the target of the deletion reservation request D61. Then, the management server 70 transmits the deletion request D62 to the friend device 51.

[0133] Thereafter, when the friend device 51 receives the deletion request D62, it performs processing in step S97. In step S97, the friend device 51 deletes the friend key information DKF in accordance with the deletion request D62. Then, the friend device 51 transmits a deletion completion notification M62 to the management server 70, indicating that the deletion in accordance with the deletion request D62 has been completed.

[0134] Thereafter, when the management server 70 receives the completion notification M62, the management server 70 performs the process of step S98. In step S98, the management server 70 stores the history of the deletion of the friend key information DKF from the friend device 51. Thereafter, the management server 70 proceeds to the process of step S99.

[0135] In step S99, the management server 70 generates a deletion request D63 for the authentication information AT. The deletion request D63 for the authentication information AT indicates a request to delete the authentication information AT for authenticating the friend key KF that is the target of the deletion reservation request D61. The management server 70 then transmits the deletion request D63 to the vehicle 20.

[0136] Thereafter, when the vehicle 20 receives the deletion request D63, the vehicle 20 performs the processing of step S100. In step S100, the vehicle 20 deletes the authentication information AT for authenticating the friend key KF that is the target of the deletion reservation request D61 in accordance with the deletion request D63. That is, the vehicle 20 deletes the authentication package ATP of the friend key KF. The vehicle 20 then transmits a completion notification M63 to the management server 70 indicating that the deletion of the authentication information AT in accordance with the deletion request D63 has been completed.

[0137] Thereafter, when the management server 70 receives the completion notification M63, the management server 70 performs the process of step S101. In step S101, the management server 70 stores the deletion history of the authentication information AT for authenticating the friend key KF to be deleted in this series of deletion-related processes. Then, the management server 70 proceeds to the process of step S102.

[0138] In step S102, the management server 70 updates the database DB. Specifically, the management server 70 deletes the friend device 51 having the friend key KF to be deleted in this series of processes from the data DA of the vehicle 20 in the database DB. Thereafter, the management server 70 transmits a completion notification M64 to the owner device 40, indicating that the series of deletions of the friend key KF in accordance with the deletion reservation request D61 has been completed.

[0139] Thereafter, when the owner device 40 receives the completion notification M64, the owner device 40 performs the process of step S103. In step S103, the owner device 40 presents information indicating that the deletion of the friend key KF that is the target of the deletion reservation request D61 has been completed to the HMI 32. Thereafter, the management system 10 ends the series of processes for deleting the current friend key KF.

[0140] <Deletion of a friend key KF due to a deletion operation on a friend device 50> As shown in Figure 11, the management system 10 performs a series of processes to delete the friend key KF indicated by the friend key information DKF stored in the friend device 51 due to a deletion operation on the friend device 51.

[0141] When a predetermined operation requesting the deletion of the friend key KF is executed in the friend device 51, the friend device 51 first performs the processing of step S111. In step S111, the friend device 51 deletes the friend key information DKF in accordance with the predetermined operation. Thereafter, the friend device 51 transmits a completion notification M71 to the management server 70 indicating that the deletion of the friend key information DKF has been completed.

[0142] Thereafter, when the management server 70 receives the completion notification M71, the management server 70 performs the process of step S112. In step S112, the management server 70 stores the history of the deletion of the friend key information DKF in the friend device 51. Thereafter, the management server 70 transmits a completion notification M72 to the owner device 40, indicating that the deletion of the friend key information DKF has been completed.

[0143] Thereafter, when the owner device 40 receives the completion notification M72, the owner device 40 performs the process of step S113. In step S113, the owner device 40 presents to the HMI 32 information indicating that the deletion of the friend key information DKF of the friend device 51 has been completed.

[0144] After the process of step S112, the management server 70 performs the process of step S114. In step S114, the management server 70 generates a deletion request D71 requesting the deletion of the authentication information AT for authenticating the friend key information DKF that was deleted in step S111. The management server 70 then transmits the deletion request D71 to the vehicle 20.

[0145] Thereafter, when vehicle 20 receives deletion request D71, vehicle 20 performs processing in step S115. In step S115, vehicle 20 deletes authentication information AT for authenticating friend key information DKF deleted in step S111 in accordance with deletion request D71. Then, vehicle 20 transmits completion notification M73 to management server 70 indicating that deletion of authentication information AT in accordance with deletion request D71 has been completed.

[0146] Thereafter, when the management server 70 receives the completion notification M73, the management server 70 performs the process of step S116. In step S116, the management server 70 stores the history of the deletion of the authentication information AT for authenticating the friend key information DKF that was completely deleted in step S111. Thereafter, the management server 70 proceeds to the process of step S117.

[0147] In step S117, the management server 70 updates the database DB. Specifically, the management server 70 deletes the friend device 51 having the friend key KF to be deleted in this series of processes from the data DA of the vehicle 20 in the database DB. This causes the management system 10 to end the series of processes for deleting the friend key KF.

[0148] <Counting Method by Management Server 70> As described above, there is an upper limit to the number of pieces of authentication information AT that can be stored in the vehicle 20. The management server 70 determines the number of pieces of authentication information AT stored in the vehicle 20 based on the counting program PC. Then, the management server 70 executes processing according to the number of pieces of authentication information AT stored in the vehicle 20 based on the counting program PC. The specific processing executed by the management server 70 based on the counting program PC will be described below.

[0149] <Counting Executed After Digital Key Registration> After a share key KS is registered in the management system 10, the counting program PC causes the management server 70 to count the number of pieces of authentication information AT stored in the vehicle 20. The following describes the series of steps from when the share key KS is registered until processing is executed according to the number of pieces of authentication information AT stored in the vehicle 20. In the following description, the processing executed by the execution unit 36 ​​will be described as processing executed by the device 30. The processing executed by the execution unit 71 will be described as processing executed by the management server 70.

[0150] After the share key KS is registered, the management system 10 performs a series of processes shown in Fig. 12. After performing the series of processes shown in Fig. 6 or 7, the management system 10 performs a series of processes shown in Fig. 12.

[0151] After the digital key is registered, the management server 70 first performs the process of step S121. In step S121, the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20.

[0152] The management server 70 stores data DA including information indicating the type of digital key registered in the vehicle 20, the registered devices 30, and the relationships between the registered devices 30. The number of pieces of authentication information AT stored in the vehicle 20 matches the number of digital keys registered in the vehicle 20. The number of pieces of authentication information AT stored in the vehicle 20 matches the number of devices 30 that store key information DK. The management server 70 can confirm the number of pieces of authentication information AT stored in the vehicle 20 by referring to the database DB. After confirming the number of pieces of authentication information AT stored in the vehicle 20, the management server 70 proceeds to step S122.

[0153] In step S122, the management server 70 calculates the difference DF. The difference DF is the difference between the maximum number of digital keys that can be registered to the vehicle 20 and the number of pieces of authentication information AT stored in the storage device 28. The authentication information AT is information related to the digital key, i.e., key-related information. The management server 70 calculates the difference DF when the digital key is registered. In other words, the management server 70 calculates the difference DF when the digital key registration process is completed.

[0154] If the difference DF is equal to or less than the predetermined number PN, the management server 70 performs the process of step S123. The predetermined number PN is a reference value for determining whether the number of pieces of authentication information AT stored in the storage device 28 is approaching an upper limit. The predetermined number PN is determined in advance by the user of the owner device 40, who is the owner of the vehicle 20. For example, the owner of the vehicle 20 specifies the predetermined number PN through operation of the owner device 40. The management server 70 sets the predetermined number PN as specified by the owner device 40. If the calculated difference DF is greater than the predetermined number PN, the processes from step S123 onwards are not performed.

[0155] When the difference DF is equal to or smaller than the predetermined number PN, the management server 70 transmits a shortage notification M81 to the owner device 40. The shortage notification M81 is a signal indicating that the difference DF is equal to or smaller than the predetermined number PN. The shortage notification M81 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20.

[0156] Upon receiving the shortage notification M81, the owner device 40 performs the process of step S123. In the process of step S123, the owner device 40 notifies the HMI 32 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20.

[0157] If the calculated difference DF is equal to or less than the predetermined number PN, the management server 70 transmits a shortage notification M81 to the friend device 51. Upon receiving the shortage notification M81, the friend device 51 performs the process of step S124. In the process of step S124, the friend device 51 notifies the HMI 32 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20. This causes the management system 10 to end the series of processes for counting after the digital key is registered.

[0158] <Counting Executed After a Digital Key is Deleted> After causing the management server 70 to send a shortage notification M81, the counting program PC causes the management server 70 to count the number of pieces of authentication information AT stored in the vehicle 20 when a share key KS is deleted in the management system 10. The following describes a series of steps performed in accordance with the number of pieces of authentication information AT stored in the vehicle 20 when a share key KS is deleted after the shortage notification M81 is sent. In the following description, the processing executed by the execution unit 36 ​​will be described as processing executed by the device 30. The processing executed by the execution unit 71 will be described as processing executed by the management server 70.

[0159] When a share key KS is deleted after a shortage notification M81 is sent, the management system 10 performs the series of processes shown in Fig. 13. When the management system 10 performs the series of processes shown in Fig. 12 and then performs the series of processes shown in any one of Figs. 8 to 11, the management system 10 performs the series of processes shown in Fig. 13.

[0160] The management server 70 first performs the process of step S131. In step S131, the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20. The manner in which the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20 is the same as the manner in step S121 of Fig. 12. After checking the number of pieces of authentication information AT stored in the vehicle 20, the management server 70 proceeds to the process of step S132.

[0161] In step S132, the management server 70 calculates the difference DF. If the calculated difference DF is greater than a predetermined number PN, the management system 10 performs the processes from step S133 onward. If the calculated difference DF is equal to or less than the predetermined number PN, the processes from step S133 onward are not performed.

[0162] If the calculated difference DF is greater than the predetermined number PN, the management server 70 transmits a recovery notification M91 to the owner device 40. The recovery notification M91 is a signal indicating that the difference DF has become greater than the predetermined number PN.

[0163] Upon receiving the recovery notification M91, the owner device 40 performs the process of step S133. In the process of step S133, the owner device 40 notifies the HMI 32 that the difference DF has become larger than the predetermined number PN.

[0164] If the calculated difference DF is greater than the predetermined number PN, the management server 70 transmits a recovery notification M91 to the friend device 51. Upon receiving the recovery notification M91, the friend device 51 performs the process of step S134. In the process of step S134, the friend device 51 presents information indicating that the difference DF has become greater than the predetermined number PN to the HMI 32. This causes the management system 10 to end the series of processes for counting after the digital key has been deleted.

[0165] <Operation of First Embodiment> The management server 70 notifies the owner device 40 that the difference DF is equal to or less than the predetermined number PN.

[0166] <Effects of the First Embodiment> (1-1) The management server 70 can notify the owner when the number of pieces of authentication information AT stored in the vehicle 20 increases.

[0167] (1-2) When the difference DF is equal to or smaller than the predetermined number PN, the execution device 71 transmits a shortage notification M81 to a shared device 50, which is a device 30 different from the owner device 40 among the multiple devices 30.

[0168] The management server 70 transmits a shortage notification M81 to the shared device 50. This allows the management server 70 to notify the owner and the user of the shared device 50 that the number of pieces of authentication information AT stored in the vehicle 20 has increased.

[0169] (1-3) After sending the shortage notification M81, when the difference DF becomes larger than a predetermined number PN, the execution device 71 sends a recovery notification M91 to the owner device 40 indicating that the difference DF has become larger than the predetermined number PN.

[0170] The management server 70 notifies the owner that the difference DF is equal to or less than the predetermined number PN, and then notifies the owner that the difference DF has become greater than the predetermined number PN. This allows the management server 70 to inform the owner that the possibility of the difference DF becoming equal to or less than the predetermined number PN has decreased.

[0171] (1-4) The executing device 71 checks the difference DF when the digital key registration process is completed. The executing device 71 checks the difference DF every time the digital key registration process is completed. When the difference DF is equal to or less than a predetermined number PN, the executing device 71 sends a shortage notification M81.

[0172] When the digital key registration process is complete, the management server 70 determines whether to notify the user of the device 30 that the difference DF is equal to or less than the predetermined number PN. This allows the management server 70 to detect every time the difference DF falls below the predetermined number PN and notify the owner that the number of pieces of authentication information AT stored in the vehicle 20 is increasing.

[0173] (1-5) The execution device 71 transmits the shortage notification M81 along with information indicating the number of pieces of key-related information stored in the vehicle 20. The management server 70 notifies the owner of the number of pieces of authentication information AT, which is key-related information stored in the vehicle 20. This allows the management server 70 to inform the owner of the remaining amount of authentication information AT stored in the vehicle 20 before the number of pieces of authentication information AT reaches the upper limit.

[0174] (1-6) The predetermined number PN is set by the owner. As a result, when the difference DF falls below the number set by the owner, the management server 70 can notify the owner that the number of pieces of authentication information AT stored in the vehicle 20 has increased.

[0175] Second Embodiment A second embodiment of the management system will be described below with reference to the drawings. The second embodiment differs from the first embodiment in that the vehicle management device 26 of the vehicle 20 stores a counting program PC. The following description will focus on the differences from the first embodiment, and descriptions of the same points will be simplified or omitted.

[0176] <Configuration of vehicle 20> As shown in Fig. 14, the storage device 28 stores a count program PC2. When executed by the execution device 27, the count program PC2 causes the execution device 27 to count the number of pieces of authentication information AT stored in the vehicle 20. When executed by the execution device 27, the count program PC causes the execution device 27 to perform control according to the number of pieces of authentication information AT stored in the vehicle 20. In the second embodiment, because the vehicle 20 stores the count program PC2, the management server 70 does not need to store the count program PC.

[0177] <Counting Method by Vehicle 20> Based on the counting program PC2, the vehicle 20 determines the number of pieces of authentication information AT stored in the storage device 28 of the vehicle 20. Then, based on the counting program PC2, the vehicle 20 executes processing according to the number of pieces of authentication information AT stored in the vehicle 20. The specific processing executed by the vehicle 20 based on the counting program PC2 will be described below.

[0178] <Counting Executed After Digital Key Registration> After a share key KS is registered in the management system 10, the counting program PC2 causes the vehicle 20 to count the number of pieces of authentication information AT stored in itself. The following describes a series of steps from when the share key KS is registered until processing is executed according to the number of pieces of authentication information AT stored in the vehicle 20. In the following description, the processing executed by the execution unit 36 ​​will be described as processing executed by the device 30. The processing executed by the execution unit 27 will be described as processing executed by the vehicle 20.

[0179] After the share key KS is registered, the management system 10 performs a series of processes shown in Fig. 15. In the second embodiment, the series of processes shown in Fig. 15 is executed instead of the series of processes shown in Fig. 12. The management system 10 performs the series of processes shown in Fig. 15 after executing the series of processes shown in Fig. 6 or 7. In Fig. 15, the vehicle 20 communicates with the owner device 40 and the friend device 51 via the management server 70 and the device server 60.

[0180] After the digital key is registered, the vehicle 20 first performs the process of step S141. In step S141, the vehicle 20 checks the number of pieces of authentication information AT stored in the vehicle 20. After checking the number of pieces of authentication information AT stored in the vehicle 20, the vehicle 20 performs the process of step S142. In step S142, the vehicle 20 calculates the difference DF. The vehicle 20 calculates the difference DF when the digital key is registered.

[0181] If the difference DF is equal to or smaller than the predetermined number PN, the management system 10 performs the process of step S143. If the calculated difference DF is greater than the predetermined number PN, the processes from step S143 onward are not performed.

[0182] When the difference DF is equal to or smaller than the predetermined number PN, the vehicle 20 transmits a shortage notification M101 to the owner device 40. The shortage notification M101 is a signal indicating that the difference DF is equal to or smaller than the predetermined number PN. The shortage notification M101 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20.

[0183] Upon receiving the shortage notification M101, the owner device 40 performs the process of step S143. In the process of step S143, the owner device 40 notifies the HMI 32 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20.

[0184] If the calculated difference DF is equal to or less than the predetermined number PN, the vehicle 20 transmits a shortage notification M101 to the friend device 51. Upon receiving the shortage notification M101, the friend device 51 performs the process of step S144. In the process of step S144, the friend device 51 notifies the HMI 32 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20. This causes the management system 10 to end the series of processes for counting after the digital key is registered.

[0185] <Counting Executed After a Digital Key is Deleted> After the vehicle 20 transmits a shortage notification M101, the counting program PC causes the vehicle 20 to count the number of pieces of authentication information AT stored in the vehicle 20 when the share key KS is deleted in the management system 10. The following describes a series of steps performed in accordance with the number of pieces of authentication information AT stored in the vehicle 20 when the share key KS is deleted after the shortage notification M101 is transmitted. In the following description, the processing executed by the execution unit 36 ​​will be described as processing executed by the device 30. The processing executed by the execution unit 27 will be described as processing executed by the vehicle 20.

[0186] When the share key KS is deleted after the shortage notification M101 is transmitted, the management system 10 performs the series of processes shown in Fig. 16 instead of the series of processes shown in Fig. 13. When the management system 10 performs the series of processes shown in any one of Figs. 8 to 11 after performing the series of processes shown in Fig. 15, the management system 10 performs the series of processes shown in Fig. 16. In Fig. 16, the vehicle 20 communicates with the owner device 40 and the friend device 51 via the management server 70 and the device server 60.

[0187] First, vehicle 20 performs the process of step S151. In step S151, vehicle 20 checks the number of pieces of authentication information AT stored in vehicle 20. After checking the number of pieces of authentication information AT stored in vehicle 20, vehicle 20 proceeds to step S152.

[0188] In step S152, the vehicle 20 calculates the difference DF. If the calculated difference DF is greater than a predetermined number PN, the management system 10 performs the processes from step S153 onward. If the calculated difference DF is equal to or less than the predetermined number PN, the processes from step S153 onward are not performed.

[0189] When the calculated difference DF is greater than the predetermined number PN, the vehicle 20 transmits a recovery notification M111 to the owner device 40. The recovery notification M111 is a signal indicating that the difference DF has become greater than the predetermined number PN.

[0190] Upon receiving the recovery notification M111, the owner device 40 performs the process of step S153. In the process of step S153, the owner device 40 notifies the HMI 32 that the difference DF has become larger than the predetermined number PN.

[0191] If the calculated difference DF is greater than the predetermined number PN, the vehicle 20 transmits a recovery notification M111 to the friend device 51. Upon receiving the recovery notification M111, the friend device 51 performs the process of step S154. In the process of step S154, the friend device 51 presents information indicating that the calculated difference DF has become greater than the predetermined number PN to the HMI 32. This causes the management system 10 to end the series of processes for counting after the digital key has been deleted.

[0192] <Functions and Effects of the Second Embodiment> (2-1) The vehicle 20 notifies the owner that the difference DF is equal to or less than the predetermined number PN. This allows the vehicle 20 to notify the owner that the number of pieces of authentication information AT stored in the vehicle 20 is increasing.

[0193] (2-2) When the difference DF is equal to or smaller than the predetermined number PN, the execution apparatus 27 transmits a shortage notification M101 to a shared device 50, which is a device 30 different from the owner device 40, among the multiple devices 30.

[0194] The vehicle 20 transmits a shortage notification M101 to the shared device 50. This allows the vehicle 20 to notify the owner and the user of the shared device 50 that the number of pieces of authentication information AT stored in the vehicle 20 has increased.

[0195] (2-3) After sending the shortage notification M101, when the difference DF becomes larger than a predetermined number PN, the execution device 27 sends a recovery notification M111 to the owner device 40 indicating that the difference DF has become larger than the predetermined number PN.

[0196] After notifying the owner that the difference DF is equal to or less than the predetermined number PN, the vehicle 20 notifies the owner that the difference DF has become greater than the predetermined number PN, thereby enabling the vehicle 20 to inform the owner that the number of pieces of authentication information AT stored in the vehicle 20 is less likely to reach the upper limit.

[0197] (2-4) When the digital key registration process is completed, the execution unit 27 calculates the difference DF. If the difference DF is equal to or less than the predetermined number PN, the execution unit 27 transmits a shortage notification M101.

[0198] When the digital key registration process is completed, the vehicle 20 determines whether to notify the user of the device 30 that the difference DF is equal to or less than the predetermined number PN. This allows the vehicle 20 to detect every time the difference DF falls below the predetermined number PN and notify the owner that the amount of authentication information AT stored in the vehicle 20 is increasing.

[0199] (2-5) The execution device 27 transmits information indicating the number of pieces of key-related information stored in the vehicle 20 along with the shortage notification M101. The vehicle 20 notifies the owner of the number of pieces of authentication information AT, which is key-related information stored in the vehicle 20. This allows the vehicle 20 to inform the owner of the remaining amount of authentication information AT stored in the vehicle 20 before the number of pieces of authentication information AT reaches the upper limit.

[0200] (2-6) The predetermined number PN is set by the owner. Thus, when the difference DF falls below the number set by the owner, the vehicle 20 can notify the owner that the number of pieces of authentication information AT stored in the vehicle 20 is increasing.

[0201] (Third Embodiment) Hereinafter, a third embodiment of the management system will be described with reference to the drawings. The third embodiment differs from the first embodiment in that a shortage notification is transmitted to the vehicle 20. The following description will focus on the differences from the first embodiment, and descriptions of the same points will be simplified or omitted.

[0202] <Counting Executed After Digital Key Registration> The management system 10 of the third embodiment counts the number of pieces of authentication information AT stored in the vehicle 20 after the share key KS is registered. The following describes a series of steps performed in the management system 10 of the third embodiment after the share key KS is registered, up to the execution of processing according to the number of pieces of authentication information AT stored in the vehicle 20. In the following description, the processing executed by the execution device 27 will be described as processing executed by the vehicle 20. The processing executed by the execution device 71 will be described as processing executed by the management server 70.

[0203] After the share key KS is registered, the management system 10 performs a series of processes shown in Fig. 17. In the third embodiment, the series of processes shown in Fig. 17 is executed instead of the series of processes shown in Fig. 12. After executing the series of processes shown in Fig. 6 or Fig. 7, the management system 10 performs the series of processes shown in Fig. 17.

[0204] After the digital key is registered, the management server 70 first performs the process of step S161. In step S161, the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20.

[0205] After confirming the number of pieces of authentication information AT stored in the vehicle 20, the management server 70 performs the process of step S162. In step S162, the management server 70 calculates the difference DF. The management server 70 calculates the difference DF when the digital key is registered.

[0206] If the calculated difference DF is equal to or smaller than the predetermined number PN, the management system 10 performs the process of step S163. If the calculated difference DF is greater than the predetermined number PN, the management system 10 does not perform the process of step S163.

[0207] When the difference DF is equal to or smaller than the predetermined number PN, the management server 70 transmits a shortage notification M121 to the vehicle 20. The shortage notification M121 is a signal indicating that the difference DF is equal to or smaller than the predetermined number PN. The shortage notification M121 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20.

[0208] Upon receiving the shortage notification M121, the vehicle 20 performs the process of step S163. In the process of step S163, the vehicle 20 notifies the HMI 22 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20. This causes the management system 10 to end the series of processes for counting after the digital key is registered.

[0209] As described above, in the management system 10 of the third embodiment, the shortage notification M121 is transmitted to the HMI 22, which is a display device provided in the vehicle 20. <Counting Executed After a Digital Key is Deleted> After the shortage notification M121 is transmitted in FIG. 17 , if the share key KS is deleted in the management system 10, the management system 10 counts the number of pieces of authentication information AT stored in the vehicle 20. The following describes a series of steps performed in accordance with the number of pieces of authentication information AT stored in the vehicle 20 when the share key KS is deleted after the shortage notification M121 is transmitted. In the following description, the processing executed by the execution device 27 will be described as processing executed by the vehicle 20. The processing executed by the execution device 71 will be described as processing executed by the management server 70.

[0210] When a share key KS is deleted after a shortage notification M121 is sent, the management system 10 performs the series of processes shown in Fig. 18 instead of the series of processes shown in Fig. 13. When the management system 10 performs the series of processes shown in Fig. 17 and then performs the series of processes shown in any one of Figs. 8 to 11, the management system 10 performs the series of processes shown in Fig. 18.

[0211] The management server 70 first performs the process of step S171. In step S171, the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20. After checking the number of pieces of authentication information AT stored in the vehicle 20, the management server 70 proceeds to step S172.

[0212] In step S172, the vehicle 20 calculates the difference DF. If the calculated difference DF is greater than the predetermined number PN, the management system 10 performs the process of step S173. If the calculated difference DF is equal to or less than the predetermined number PN, the management system 10 does not perform the process of step S173.

[0213] If the calculated difference DF is greater than the predetermined number PN, the management server 70 transmits a recovery notification M131 to the vehicle 20. The recovery notification M131 is a signal indicating that the difference DF has become greater than the predetermined number PN.

[0214] Upon receiving the recovery notification M131, the vehicle 20 performs the process of step S173. In the process of step S173, the vehicle 20 notifies the HMI 22 that the difference DF has become greater than the predetermined number PN. This causes the management system 10 to end the series of processes for counting after the digital key has been deleted.

[0215] As described above, in the management system 10 of the third embodiment, the recovery notification M131 is transmitted to the HMI 22, which is a display device provided in the vehicle 20. <Functions and Effects of the Third Embodiment> (3-1) The management server 70 transmits information indicating that the difference DF is equal to or less than the predetermined number PN to the display device of the vehicle 20. This enables the management server 70 to notify the owner that the number of pieces of authentication information AT stored in the vehicle 20 is increasing.

[0216] (3-2) After sending the shortage notification M121, when the difference DF becomes larger than the predetermined number PN, the execution device 71 sends a recovery notification M131 to the display device indicating that the difference DF has become larger than the predetermined number PN.

[0217] The management server 70 notifies the owner that the difference DF is equal to or less than the predetermined number PN, and then notifies the owner that the difference DF has become greater than the predetermined number PN. This allows the management server 70 to inform the owner that the possibility of the difference DF becoming equal to or less than the predetermined number PN has decreased.

[0218] (3-3) The management server 70 of the third embodiment achieves the effects of (1-4) to (1-6) in the first embodiment. (Fourth Embodiment) A fourth embodiment of the management system will be described below with reference to the drawings. The fourth embodiment differs from the second embodiment in that a shortage notification is not sent. The following description will focus on the differences from the second embodiment, and the description of the same points will be simplified or omitted.

[0219] <Counting Executed After Digital Key Registration> In the management system 10 of the fourth embodiment, after a share key KS is registered, the vehicle 20 counts the number of pieces of authentication information AT stored in the vehicle 20. The following describes a series of steps in the management system 10 of the fourth embodiment, from when a share key KS is registered until a process corresponding to the number of pieces of authentication information AT stored in the vehicle 20 is executed. In the following description, the process executed by the execution device 27 is described as a process executed by the vehicle 20.

[0220] After the share key KS is registered, the vehicle 20 performs the series of processes shown in Fig. 19. In the fourth embodiment, the series of processes shown in Fig. 19 is executed instead of the series of processes shown in Fig. 15. The management system 10 performs the series of processes shown in Fig. 19 after executing the series of processes shown in Fig. 6 or Fig. 7.

[0221] After the digital key is registered, the vehicle 20 first performs the process of step S181. In step S181, the management server 70 checks the number of pieces of authentication information AT stored in the vehicle 20.

[0222] After confirming the number of pieces of authentication information AT stored in the vehicle 20, the vehicle 20 performs the process of step S182. In step S182, the vehicle 20 calculates the difference DF. After calculating the difference DF, the vehicle 20 determines in the process of step S183 whether the calculated difference DF is equal to or less than a predetermined number PN.

[0223] If the management system 10 determines that the calculated difference DF is equal to or less than the predetermined number PN (step S183: YES), the management system 10 proceeds to step S184. In step S184, the vehicle 20 notifies the HMI 22 that the difference DF is equal to or less than the predetermined number PN and the specific number of pieces of authentication information AT stored in the vehicle 20. This completes the series of processes for counting after the digital key is registered.

[0224] If the vehicle 20 determines that the calculated difference DF is greater than the predetermined number PN (step S183: NO), it does not perform the processing of step S184 and ends the series of processing for counting after the digital key is registered.

[0225] <Counting Executed After a Digital Key is Deleted> After displaying in Figure 19 that the difference DF is equal to or less than the predetermined number PN, if the share key KS is deleted in the management system 10, the vehicle 20 counts the number of pieces of authentication information AT stored in itself. Below, a series of steps will be described when the vehicle 20 displays that the difference DF is equal to or less than the predetermined number PN and then executes processing according to the number of pieces of authentication information AT stored in the vehicle 20 if the share key KS is deleted. In the following description, the processing executed by the execution device 27 will be described as processing executed by the vehicle 20.

[0226] After displaying that the difference DF is equal to or less than the predetermined number PN, if the share key KS is deleted, the vehicle 20 performs the series of processes shown in Fig. 20 instead of the series of processes shown in Fig. 16. The vehicle 20 performs the series of processes shown in Fig. 19, and then performs the series of processes shown in Fig. 20 if the series of processes shown in any one of Figs. 8 to 11 has been performed.

[0227] First, the vehicle 20 performs the process of step S191. In step S191, the vehicle 20 checks the number of pieces of authentication information AT stored in the vehicle 20. After checking the number of pieces of authentication information AT stored in the vehicle 20, the process proceeds to step S192.

[0228] In step S192, the vehicle 20 calculates the difference DF. After calculating the difference DF, the vehicle 20 determines in step S193 whether the calculated difference DF is greater than the predetermined number PN. In this way, the vehicle 20 calculates the difference DF when the digital key is registered.

[0229] If the management system 10 determines that the calculated difference DF is greater than the predetermined number PN (step S193: YES), the management system 10 proceeds to step S194. In step S194, the vehicle 20 notifies the HMI 22 that the difference DF is greater than the predetermined number PN. This causes the vehicle 20 to end the series of processes for counting after the digital key is registered.

[0230] On the other hand, if the vehicle 20 determines that the calculated difference DF is equal to or less than the predetermined number PN (step S193: NO), it does not perform the processing of step S194 and ends the series of processes for counting after the digital key is registered.

[0231] <Functions and Effects of the Fourth Embodiment> (4-1) The vehicle 20 displays on the display device that the difference DF is equal to or less than the predetermined number PN. This allows the vehicle 20 to notify the owner that the amount of information related to the digital key stored in the vehicle 20 is increasing.

[0232] (4-2) The execution device 27 displays on the display device that the difference DF is less than or equal to a predetermined number PN, and then, when the difference DF becomes greater than the predetermined number PN, displays on the display device that the difference DF has become greater than the predetermined number PN.

[0233] After notifying the owner that the difference DF is equal to or less than the predetermined number PN, the vehicle 20 notifies the owner that the difference DF has become greater than the predetermined number PN, thereby enabling the vehicle 20 to inform the owner that the possibility of the difference DF becoming equal to or less than the predetermined number PN has decreased.

[0234] (4-3) When the digital key registration process is completed, the execution unit 27 calculates the difference DF. If the difference DF is equal to or less than the predetermined number PN, the execution unit 27 displays a message on the display device indicating that the difference DF is equal to or less than the predetermined number PN.

[0235] When the digital key registration process is completed, the vehicle 20 checks the difference DF and determines whether to notify the user of the device 30 that the difference DF is equal to or less than the predetermined number PN. This allows the vehicle 20 to detect without fail that the difference DF has become equal to or less than the predetermined number PN, and to notify the owner that the amount of authentication information AT stored in the vehicle 20 has increased.

[0236] (4-4) The execution device 27 displays on the display device a message that the difference DF has become larger than the predetermined number PN, as well as information indicating the number of pieces of key-related information stored in the storage device 28 of the vehicle 20.

[0237] The vehicle 20 indicates to the owner the number of pieces of authentication information AT, which are key-related information stored in the vehicle 20. This allows the vehicle 20 to inform the owner of the remaining time before the number of pieces of authentication information AT stored in the vehicle 20 reaches the upper limit.

[0238] (4-5) The vehicle 20 of the fourth embodiment achieves the effect of (2-6) in the second embodiment. (Other Embodiments) The above-described embodiments can be modified as follows. The embodiments and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0239] <Management System 10> The vehicle 20 does not need to have some of the BLE module 23, the UWB module 24, and the NFC module 25. As long as the vehicle 20 has at least one module, it can perform short-range communication with the device 30. The vehicle 20 is not limited to these modules, and it is sufficient that the vehicle 20 has a module that performs short-range communication with the device 30.

[0240] The digital key-related matters in the above embodiments do not have to comply with the CCC. The vehicle management device 26 is not limited to a digital key ECU. For example, the vehicle management device 26 may be a central ECU that manages multiple ECUs in the vehicle 20.

[0241] In each of the above embodiments, the vehicle management device 26 includes an execution device 27, which is a processing circuit including one or more processors that execute various processes according to a computer program (software). However, the vehicle management device 26 may also include a processing circuit including one or more dedicated hardware circuits, such as an application-specific integrated circuit (ASIC), that executes at least some of the various processes. Alternatively, the vehicle management device 26 may include a circuit including a combination of one or more processors and one or more dedicated hardware circuits. The processor includes a CPU and memory such as RAM and ROM. The memory stores program code or instructions configured to cause the CPU to execute processes. The memory, i.e., computer-readable medium, includes any available medium that can be accessed by a general-purpose or dedicated computer. The same applies to the device 30 and the management server 70.

[0242] The device 30 is not limited to a smartphone. The device 30 may be a smartwatch. The device 30 may be a predetermined server. In this case, the predetermined server may include the device 30. For example, if a rental business operator or a sharing business operator is the owner of the vehicle 20, the owner device 40 may be included in the predetermined server. For example, the friend device 51 may be included in the predetermined server.

[0243] The share device 50 has a function to receive the share key KS as in the above embodiment. A device 30 having a function to receive a digital key, such as the share device 50, is sometimes called a receiver device.

[0244] In each of the above embodiments, the digital keys are arranged in a hierarchy of owner keys KO, friend keys KF, and non-friend keys KN in that order. The higher the hierarchy of the digital keys, the greater the authority. The digital keys do not necessarily have to be arranged in a hierarchy of greater authority. For example, the same level of authority may be set for the three hierarchies of the owner keys KO, friend keys KF, and non-friend keys KN.

[0245] The device server 60 does not have to be provided for each type of device 30. It is sufficient that multiple devices 30 and the management server 70 are capable of wireless communication. The device server 60 may be omitted. It is sufficient that multiple devices 30 and the management server 70 are capable of direct wireless communication.

[0246] The management server 70 may be configured with multiple servers. For example, the management server 70 may be configured with a server that stores the database DB and a server that executes the server program PS. For example, the management server 70 may be configured with a server that communicates with the vehicle 20 and a server that communicates with the device server 60, and these servers may be able to communicate with each other.

[0247] The management server 70 does not need to store the database DB. The management server 70 only needs to manage, for at least one digital key in the management system 10, a combination of the key information DK of the device 30 and the authentication information AT of the vehicle management device 26.

[0248] <Various Information> The authentication information AT is not limited to the examples in the above embodiments, as long as it is information for authenticating the digital key when using the digital key. For example, the authentication information AT may be a common key shared by the vehicle management device 26 and the device 30. Also, for example, the authentication information AT may be a common secret key.

[0249] The information included in the key information DK is not limited to the configuration described in the above embodiment. For example, the owner key information DKO does not need to include the slot identification information ST4. Furthermore, the key information DK may include information indicating the type of digital key. The type of digital key is, for example, information indicating one of the owner key KO, friend key KF, and non-friend key KN.

[0250] The database DB may include information indicating the type of the device 30. The type of the device 30 is information indicating, for example, one of a smartphone, a smartwatch, a predetermined server, and the like.

[0251] The structure of the data DA in the database DB is not limited to the examples in the above embodiments. The database DB only needs to include information necessary for management by the management server 70 in the management system 10.

[0252] In the database DB, the authority may be set for each digital key, rather than being uniformly determined according to the type of digital key. The authority may not be determined in the database DB.

[0253] <Processing for Registering a Digital Key> The processing for registering the owner key KO is not limited to the examples in the above embodiments. For example, the owner device 40 may store the owner key information DKO by transmitting and receiving information such as the generated data DC between the vehicle 20 and the first device 30A via the management server 70, even if pairing is not performed in the processing of step S12. The processing for registering the owner key KO may be modified as appropriate to suit the structure of the information included in the owner key information DKO and the structure of the information included in the authentication information AT.

[0254] The series of processes for registering the friend key KF is not limited to the examples in the above embodiments. For example, the management server 70 may update the database DB by processing in step S29 after transmitting the authentication package ATP and the storage request D24 to the vehicle 20. The series of processes for registering the friend key KF may be modified as appropriate to suit the structure of the information included in the friend key information DKF and the structure of the information included in the authentication information AT.

[0255] The series of processes for registering the non-friend key KN is not limited to the examples in the above embodiments. The order of the processes may be different from the series of processes for registering the friend key KF in the above embodiments. The series of processes for registering the non-friend key KN may be modified as appropriate to suit the structure of the information contained in the non-friend key information DKN and the structure of the information contained in the authentication information AT.

[0256] The types of digital keys do not have to include the non-friend key KN. In other words, in the management system 10, the share key KS may only be the friend key KF. <Processing for Deleting a Digital Key> In each of the above embodiments, when deleting a non-friend key KN, the friend device 51 sends a deletion reservation request D41 to the management server 70, requesting that the non-friend key KN be deleted when the specified condition RC is met. The friend device 51 may also send a request to delete the non-friend key KN to the management server 70 regardless of the specified condition RC. The management server 70 may execute the processing from step S62 onwards in response to a request to delete the non-friend key KN from not only the friend device 51 but also the owner device 40.

[0257] In the above embodiments, when deleting a friend key KF, the owner device 40 requests that the friend key KF be deleted when the specified condition RC is satisfied by transmitting a deletion reservation request D41 to the management server 70. The owner device 40 may also transmit a request to delete the friend key KF to the management server 70 regardless of the specified condition RC.

[0258] In each of the above embodiments, the management server 70 receives the deletion reservation request D41. However, the vehicle 20 may receive the deletion reservation request D41. In this case, the vehicle 20 may determine whether the specified condition RC is met and delete the authentication information AT when the specified condition RC is met. The vehicle 20 may then transmit a notification to the management server 70 indicating that the authentication information AT has been deleted based on the deletion reservation request D41. The management server 70 may then update the database DB and transmit a deletion request D42 to the non-friend device 52.

[0259] In each of the above embodiments, the management server 70 receives the deletion reservation request D61. However, the vehicle 20 may receive the deletion reservation request D61. In this case, the vehicle 20 may determine whether the specified condition RC is met and delete the authentication information AT when the specified condition RC is met. The vehicle 20 may then transmit a notification to the management server 70 indicating that the authentication information AT has been deleted based on the deletion reservation request D61. The management server 70 may then update the database DB and transmit a deletion request D62 to the friend device 51.

[0260] 9, when deleting a non-friend device 52 due to an operation of the non-friend device 52, a request to delete the non-friend key KN may be sent to the management server 70 before a completion notification M51 is sent to the management server 70. In this case, similar to the series of flows shown in FIG. 8, when the management server 70 receives the request, the management server 70 may send a request to delete the non-friend key information DKN to the non-friend device 52.

[0261] 11 , when deleting a friend device 51 due to an operation on the friend device 51, a request to delete the friend key KF may be sent to the management server 70 before a completion notification M71 is sent to the management server 70. In this case, similar to the series of flows shown in FIG. 10 , when the management server 70 receives the request, the management server 70 may send a request to delete the friend key information DKF to the friend device 51.

[0262] - In both cases where a non-friend key KN is deleted due to operation of a friend device 51 and where a non-friend key KN is deleted due to operation of a non-friend device 52, a reservation for deletion may be requested from the management server 70.

[0263] The owner device 40 and the vehicle 20 may request the deletion of the non-friend key KN. Alternatively, for example, the management server 70 may generate a request to delete the non-friend key KN when a predetermined condition is satisfied.

[0264] The vehicle 20 may request the deletion of the friend key KF. Alternatively, for example, the management server 70 may generate a request to delete the friend key KF when a predetermined condition is met. <Series of processes after digital key registration> The non-friend device 52 may be able to send a request to register a new non-friend key KN. In other words, the sharing device 50 may send a request to register a new non-friend key KN regardless of whether it is a friend device 51 or a non-friend device 52. In this case, the management system 10 may register the new non-friend key KN through the series of processes shown in FIG. 7.

[0265] In this case, a shortage notification M81 or a shortage notification M101 may be transmitted to the non-friend device 52. In this case, a recovery notification M91 or a recovery notification M111 may be transmitted to the non-friend device 52.

[0266] In the first to fourth embodiments, the predetermined number PN is determined in advance by the owner of the vehicle 20. In the first to fourth embodiments, the owner of the vehicle 20 refers to the user of the owner device 40. The owner of the vehicle 20 is not limited to the user of the owner device 40. For example, a user of a shared device 50 who has been granted the same authority as the owner device 40 may determine the predetermined number PN as the owner of the vehicle 20.

[0267] The predetermined number PN does not have to be determined by the owner of the vehicle 20. For example, the predetermined number PN may be determined in advance by the user of the shared device 50, rather than by the owner of the vehicle 20. For example, the predetermined number PN may be determined in advance by the provider of the vehicle 20 or the management server 70.

[0268] In the first embodiment, after the share key KS is registered, the management system 10 performs the series of processes shown in Fig. 12. The timing at which the management system 10 performs the series of processes shown in Fig. 12 is not limited to after the share key KS is registered.

[0269] For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 receives the key track request D23 and the friend key information DKF in Fig. 6 and before the management server 70 performs registration management of the friend key KF in step S29. For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the storage request D24 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the completion notification M23.

[0270] For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 receives the key track request D33 and the non-friend key information DKN in Fig. 7 and before the management server 70 performs registration management of the non-friend key KN in step S49. For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the storage request D34 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 12 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the completion notification M33.

[0271] For example, the management system 10 may periodically execute the series of processes shown in Fig. 12 regardless of whether or not a digital key has been registered. In the first embodiment, the management server 70 transmits a shortage notification M81 to the friend device 51, which is a shared device 50. The management server 70 does not have to transmit the shortage notification M81 to the shared device 50.

[0272] In the first embodiment, the shortage notification M81 sent by the management server 70 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20. The shortage notification M81 sent by the management server 70 does not have to include information indicating the number of pieces of authentication information AT stored in the vehicle 20. In this case, the device 30 that receives the shortage notification M81 does not display the number of pieces of authentication information AT stored in the vehicle 20.

[0273] In the second embodiment, after the share key KS is registered, the management system 10 performs the series of processes shown in Fig. 15. The timing at which the management system 10 performs the series of processes shown in Fig. 15 is not limited to after the share key KS is registered.

[0274] For example, the management system 10 may perform a series of processes shown in FIG. 15 after the vehicle 20 receives the storage request D24 and the authentication package ATP in FIG. 6 and before storing the authentication package ATP in step S30.

[0275] For example, the management system 10 may perform the series of processes shown in FIG. 15 after the vehicle 20 receives the storage request D34 and the authentication package ATP in FIG. 7 and before storing the authentication package ATP in step S50.

[0276] For example, the management system 10 may periodically execute the series of processes shown in Fig. 12 regardless of whether or not the digital key has been registered. In the second embodiment, the vehicle 20 transmits a shortage notification M101 to the friend device 51, which is a shared device 50. The management server 70 does not need to transmit the shortage notification M101 to the shared device 50.

[0277] In the second embodiment, the shortage notification M101 transmitted by the vehicle 20 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20. The shortage notification M101 transmitted by the vehicle 20 does not have to include information indicating the number of pieces of authentication information AT stored in the vehicle 20. In this case, the device 30 that receives the shortage notification M101 does not display the number of pieces of authentication information AT stored in the vehicle 20.

[0278] In the second embodiment, the vehicle 20 communicates with the plurality of devices 30 via the management server 70 and the device server 60 in Fig. 15. The vehicle 20 may communicate directly with the plurality of devices 30 via BLE communication or NFC communication in Fig. 15, for example. For example, the vehicle 20 can directly communicate with the plurality of devices 30 via a wireless communication network, and may directly communicate with the plurality of devices 30 via a wireless communication network in Fig. 15.

[0279] In the third embodiment, after the share key KS is registered, the management system 10 performs the series of processes shown in Fig. 17. The timing at which the management system 10 performs the series of processes shown in Fig. 17 is not limited to after the share key KS is registered.

[0280] For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 receives the key track request D23 and the friend key information DKF in Fig. 6 and before the management server 70 performs registration management of the friend key KF in step S29. For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the storage request D24 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the completion notification M23.

[0281] For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 receives the key track request D33 and the non-friend key information DKN in Fig. 7 and before the management server 70 performs registration management of the non-friend key KN in step S49. For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the storage request D34 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 17 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the completion notification M33.

[0282] For example, the management system 10 may periodically execute the series of processes shown in FIG. 17 regardless of whether or not the digital key has been registered. In the third embodiment, the shortage notification M121 sent by the management server 70 includes information indicating the number of pieces of authentication information AT stored in the vehicle 20. The shortage notification M121 sent by the management server 70 does not need to include information indicating the number of pieces of authentication information AT stored in the vehicle 20. In this case, the vehicle 20 that receives the shortage notification M121 does not need to display the number of pieces of authentication information AT stored in itself. In this case, the vehicle 20 that receives the shortage notification M121 may confirm the number of pieces of authentication information AT stored in itself and then display the number of pieces of authentication information AT stored in itself.

[0283] In the fourth embodiment, after the share key KS is registered, the management system 10 performs the series of processes shown in Fig. 19. The timing at which the management system 10 performs the series of processes shown in Fig. 19 is not limited to after the share key KS is registered.

[0284] For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 receives the key track request D23 and the friend key information DKF in Fig. 6 and before the management server 70 performs registration management of the friend key KF in step S29. For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the storage request D24 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 performs registration management of the friend key KF in step S29 in Fig. 6 and before the management server 70 sends the completion notification M23.

[0285] For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 receives the key track request D33 and the non-friend key information DKN in Fig. 7 and before the management server 70 performs registration management of the non-friend key KN in step S49. For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the storage request D34 and the authentication package ATP. For example, the management system 10 may perform the series of processes shown in Fig. 19 after the management server 70 performs registration management of the non-friend key KN in step S49 in Fig. 7 and before the management server 70 sends the completion notification M33.

[0286] For example, the management system 10 may periodically execute the series of processes shown in Figure 19 regardless of whether or not the digital key has been registered. In the fourth embodiment, the vehicle 20 displays the number of pieces of authentication information AT stored in the vehicle 20. The vehicle 20 does not need to display the number of pieces of authentication information AT stored in the vehicle 20.

[0287] <Series of processes after deletion of digital key> In the first embodiment, the management system 10 performs the series of processes shown in Fig. 13 after the share key KS is deleted. The timing when the management system 10 performs the series of processes shown in Fig. 13 is not limited to after the share key KS is deleted. For example, the management system 10 may periodically perform the series of processes shown in Fig. 13 after performing the series of processes shown in Fig. 12, regardless of whether the digital key has been deleted.

[0288] In the second embodiment, the management system 10 performs the series of processes shown in Fig. 16 after the share key KS is deleted. The timing when the management system 10 performs the series of processes shown in Fig. 16 is not limited to after the share key KS is deleted. For example, the management system 10 may periodically perform the series of processes shown in Fig. 16 after performing the series of processes shown in Fig. 15, regardless of whether the digital key has been deleted.

[0289] In the second embodiment, the vehicle 20 communicates with the plurality of devices 30 via the management server 70 and the device server 60 in Fig. 16. The vehicle 20 may communicate directly with the plurality of devices 30 via BLE communication or NFC communication in Fig. 16. For example, the vehicle 20 is capable of directly communicating with the plurality of devices 30 via a wireless communication network, and may communicate directly with the plurality of devices 30 via a wireless communication network in Fig. 16.

[0290] In the third embodiment, the management system 10 performs the series of processes shown in Fig. 18 after the share key KS is deleted. The timing when the management system 10 performs the series of processes shown in Fig. 18 is not limited to after the share key KS is deleted. For example, the management system 10 may periodically perform the series of processes shown in Fig. 18 after performing the series of processes shown in Fig. 17, regardless of whether the digital key has been deleted.

[0291] In the fourth embodiment, the management system 10 performs the series of processes shown in Fig. 20 after the share key KS is deleted. The timing when the management system 10 performs the series of processes shown in Fig. 20 is not limited to after the share key KS is deleted. For example, the management system 10 may periodically perform the series of processes shown in Fig. 20 after performing the series of processes shown in Fig. 19, regardless of whether the digital key has been deleted.

Claims

1. A management server configured to manage the registration of multiple digital keys for a vehicle, comprising: a communication module configured to communicate with the vehicle and multiple devices; and an execution device configured to control the communication module, wherein the vehicle is configured to store key-related information which is information about each of the multiple digital keys, and each of the multiple devices is configured to store information indicating at least one of the multiple digital keys, and the multiple devices include an owner device which belongs to the owner of the vehicle, and the execution device is configured to: calculate a difference between the maximum number of digital keys that can be registered for the vehicle and the number of pieces of key-related information stored in the vehicle, and when the difference becomes equal to or less than a predetermined number, control the communication module to send a shortage notification to the owner device indicating that the difference is equal to or less than the predetermined number.

2. The management server of claim 1, wherein the plurality of devices includes a shared device that is a device different from the owner device, and the execution device is configured to control the communication module and further transmit the shortage notification to the shared device when the difference is less than or equal to the predetermined number.

3. The management server of claim 1 or claim 2, wherein the execution device is configured to control the communication module to send a recovery notification to the owner device indicating that the difference has become larger than the specified number after sending the shortage notification, when the difference becomes larger than the specified number.

4. A management server configured to manage the registration of multiple digital keys for a vehicle, comprising: a communication module configured to communicate with the vehicle and multiple devices; and an execution device configured to control the communication module, wherein the vehicle is configured to store key-related information that is information about each of the multiple digital keys, and each of the multiple devices is configured to store information indicating at least one of the multiple digital keys, and the execution device is configured to calculate the difference between the maximum number of digital keys that can be registered for the vehicle and the number of pieces of key-related information stored in the vehicle, and when the difference becomes less than a predetermined number, control the communication module to send a shortage notification to a display device provided in the vehicle, indicating that the difference is less than the predetermined number.

5. The management server according to claim 4, wherein the execution device is configured to control the communication module to send a recovery notification to the display device indicating that the difference has become larger than the predetermined number after sending the shortage notification, when the difference becomes larger than the predetermined number.

6. The management server according to any one of claims 1 to 5, wherein the execution device is configured to calculate the difference when the digital key registration process is completed.

7. The management server according to any one of claims 1 to 6, wherein the execution device is configured to transmit, together with the shortage notification, information indicating the number of pieces of key-related information stored in the vehicle.

8. The management server according to any one of claims 1 to 3, wherein the execution device is configured to set the predetermined number in response to a command from the owner device.

9. A vehicle configured to communicate with a plurality of devices and a management server, comprising: a communication module; a storage device configured to store key-related information relating to each of a plurality of digital keys that can be registered to the vehicle; and an execution device configured to control the communication module, wherein the management server is configured to manage the registration of the plurality of digital keys, each of the plurality of devices is configured to store information indicating at least one of the plurality of digital keys, and the plurality of devices includes an owner device that belongs to the owner of the vehicle, and the execution device is configured to calculate the difference between the maximum number of digital keys that can be registered to the vehicle and the number of pieces of key-related information stored in the storage device, and when the difference becomes equal to or less than a predetermined number, control the communication module to send a shortage notification to the owner device indicating that the difference is equal to or less than the predetermined number.

10. The vehicle of claim 9, wherein the plurality of devices includes a share device that is a device different from the owner device, and the execution device is configured to control the communication module to further transmit the shortage notification to the share device when the difference is equal to or less than the predetermined number.

11. The vehicle according to claim 9 or 10, wherein the execution device is configured to, after sending the shortage notification, when the difference becomes larger than the predetermined number, control the communication module to send a recovery notification to the owner device indicating that the difference has become larger than the predetermined number.

12. The vehicle according to any one of claims 9 to 11, wherein the execution device is configured to calculate the difference when the digital key registration process is completed.

13. The vehicle according to any one of claims 9 to 12, wherein the execution device is configured to transmit, together with the shortage notification, information indicating the number of pieces of key-related information stored in the storage device.

14. A vehicle configured to communicate with a plurality of devices and a management server, comprising: a display device; a storage device configured to store key-related information relating to each of a plurality of digital keys that can be registered to the vehicle; and an execution device, wherein the management server is configured to manage the registration of the plurality of digital keys, each of the plurality of devices is configured to store information indicating at least one of the plurality of digital keys, and the execution device is configured to calculate the difference between the maximum number of digital keys that can be registered to the vehicle and the number of pieces of key-related information stored in the storage device, and when the difference becomes less than or equal to a predetermined number, display on the display device that the difference is less than or equal to the predetermined number.

15. The vehicle according to claim 14, wherein the execution device is configured to display on the display device that the difference is equal to or less than the predetermined number, and then, when the difference becomes greater than the predetermined number, to display on the display device that the difference has become greater than the predetermined number.

16. The vehicle according to claim 14 or 15, wherein the execution device is configured to calculate the difference when the digital key registration process is completed.

17. The vehicle according to any one of claims 14 to 16, wherein the execution device is configured to display on the display device a message indicating that the difference has become larger than the predetermined number, as well as information indicating the number of pieces of key-related information stored in the storage device.

18. The vehicle according to any one of claims 9 to 13, wherein the execution device is configured to set the predetermined number in response to a command from the owner device.

19. The vehicle according to any one of claims 14 to 17, wherein the execution device is configured to set the predetermined number in response to a specification from an owner device that is a device belonging to the owner of the vehicle.

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