Wireless key device, door unlocking system, and unlocking method

Abstract

To provide a technique to suppress an act of relay attack.SOLUTION: When receiving an unlocking signal by a LF communication and communicating with a vehicle by a short-range communication, a transmission section 222 transmits a response signal. When receiving the unlocking signal by the LF communication and not communicating with the vehicle by the short-range communication and a positional information is not included in a first area through a third area, the transmission section 222 transmits a first activation signal. When the positional information is included in a second area in the aforementioned case, the transmission section 222 transmits a second activation signal. When the positional information is included in the third area in the aforementioned case, the transmission section 222 transmits a third activation signal. When the positional information is included in the first area in the aforementioned case, the transmission section 222 does not transmit any activation signal.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to unlocking technology, and more particularly to a wireless key device, a door lock unlocking system, and an unlocking method that use wireless communication. [Background technology]

[0002] A relay attack is a method of illicitly unlocking a vehicle's door lock. In a relay attack, a signal transmitted from the vehicle to unlock the door lock is received by a third party and transmitted to a smart key located at a distance that it would not normally reach. This causes the smart key to transmit a response signal for unlocking the door, and the door lock is unlocked upon receiving the response signal. To prevent such a relay attack, if the received strength of the signal transmitted from the vehicle is high, it is determined that the door lock has been illicitly unlocked (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-67056 Summary of the Invention [Problem to be solved by the invention]

[0004] While it is important to prevent relay attacks, it is also important to deter relay attacks from occurring.

[0005] The present invention has been made in view of the above circumstances, and its purpose is to provide a technique for suppressing relay attacks. [Means for solving the problem]

[0006] In order to solve the above problem, a wireless key device of one embodiment of the present invention includes an acquisition unit that acquires location information, a memory unit that stores information on a first area, a second area, and a third area corresponding to the location information, a receiving unit that can receive an unlocking signal from the vehicle using a first wireless communication method to unlock the vehicle's doors, a communication unit that can communicate with the vehicle using a second wireless communication method different from the first wireless communication method, and a transmitting unit that, when the receiving unit receives the unlocking signal using the first wireless communication method, transmits a response signal to the vehicle to respond to the unlocking signal if the communication unit is communicating with the vehicle using the second wireless communication method. The transmitter transmits a first activation signal to the vehicle for activating the security device mounted on the vehicle for a first period if the location information is not included in the first area, the second area, or the third area when the receiver receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, and the transmitter transmits a second activation signal to the vehicle for activating the security device mounted on the vehicle for a second period shorter than the first period if the location information is included in the second area when the receiver receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method. The transmitter transmits a second activation signal to the vehicle, and when the receiver receives an unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is included in a third area, the transmitter transmits a third activation signal to the vehicle to operate the security device for a third period longer than the first period, and when the receiver receives an unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is included in the first area, the transmitter does not transmit the first activation signal, the second activation signal, or the third activation signal.

[0007] Here, "receiving from a vehicle" includes receiving from a device mounted on a vehicle, "communicating with a vehicle" includes communicating with a device mounted on a vehicle, and "transmitting to a vehicle" includes transmitting to a device mounted on a vehicle.

[0008] Another aspect of the present invention is a door lock unlocking system. The door lock unlocking system includes a vehicle equipped with a door lock and a wireless key device used to unlock the door lock. The wireless key device is capable of acquiring location information and stores information on a first area, a second area, and a third area corresponding to the location information. The vehicle transmits an unlocking signal for unlocking the vehicle door lock using a first wireless communication method. The vehicle and the wireless key device are capable of communicating with each other using a second wireless communication method different from the first wireless communication method. When the wireless key device receives the unlocking signal using the first wireless communication method and is communicating with the vehicle using the second wireless communication method, it transmits a response signal to the vehicle in response to the unlocking signal. When the wireless key device receives the unlocking signal using the first wireless communication method but is not communicating with the vehicle using the second wireless communication method, if the location information is not included in the first, second, or third area, it transmits a first activation signal to activate a security device mounted on the vehicle for a first period. When the wireless key device receives the unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method, if the location information is included in the second area, it transmits a second activation signal to the vehicle to operate the security device for a second period shorter than the first period; when the wireless key device receives the unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method, if the location information is included in the third area, it transmits a third activation signal to the vehicle to operate the security device for a third period longer than the first period; when the wireless key device receives the unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method, if the location information is included in the first area, it does not transmit the first activation signal, the second activation signal, or the third activation signal.

[0009] Yet another aspect of the present invention is an unlocking method for a wireless key device that can acquire location information and stores information on first, second, and third areas corresponding to the location information, the method including the steps of receiving an unlocking signal for unlocking the vehicle doors from the vehicle by a first wireless communication method, communicating with the vehicle by a second wireless communication method different from the first wireless communication method, transmitting a response signal to the vehicle for responding to the unlocking signal if the unlocking signal is received by the first wireless communication method and the vehicle is communicating by the second wireless communication method, and operating a security device mounted on the vehicle for a first period if the unlocking signal is received by the first wireless communication method but the vehicle is not communicating by the second wireless communication method and the location information is not included in the first, second, or third area. transmitting a first activation signal to the vehicle to activate the security device for a second period shorter than the first period if the location information is included in the second area when the security device receives an unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method; transmitting a second activation signal to the vehicle to activate the security device for a second period shorter than the first period if the location information is included in the third area when the security device receives an unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method; and not transmitting the first activation signal, the second activation signal, or the third activation signal if the location information is included in the first area when the security device receives an unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method.

[0010] Any combination of the above components, and any transformation of the present invention into a method, device, system, recording medium, computer program, etc., are also valid aspects of the present invention. [Effects of the Invention]

[0011] According to the present invention, relay attacks can be suppressed. [Brief explanation of the drawings]

[0012] [Figure 1]1(a)-(b) are diagrams showing the configuration of a door lock unlocking system to be compared. [Figure 2] 2(a) and 2(b) are diagrams showing the configuration of a door lock unlocking system according to this embodiment. [Figure 3] FIG. 3 is a diagram showing the configuration of the wireless key device of FIGS. [Figure 4] 4 is a diagram showing the data structure of a table stored in a storage unit in FIG. 3. FIG. [Figure 5] 4 is a flowchart showing a transmission procedure performed by the wireless key device of FIG. 3. [Figure 6] FIG. 10 is a diagram showing the configuration of a wireless key device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0013] Before describing the present invention in detail, an overview will be provided. An embodiment of the present invention relates to a door lock unlocking system that unlocks a door lock installed in a vehicle using a wireless key device. In the door lock unlocking system, the vehicle transmits an unlock signal to unlock the vehicle's doors. Upon receiving the unlock signal, the wireless key device transmits a response signal to respond to the unlock signal. Upon receiving the response signal, the vehicle unlocks the doors. When a user carrying the wireless key device leaves the vehicle, the wireless key device no longer receives the unlock signal and therefore does not transmit the response signal. As a result, the vehicle does not unlock the doors.

[0014] A relay attack is carried out when a repeater used by a suspicious individual is positioned between a vehicle and a wireless key device when the vehicle and the wireless key device are far enough away that the unlock signal from the vehicle cannot be received by the wireless key device. The repeater receives the unlock signal from the vehicle, amplifies it, and transmits it. In other words, the unlock signal is relayed by the repeater. When the wireless key device receives the unlock signal from the repeater, it transmits a response signal. Since the response signal generally has a longer transmission distance than the unlock signal, the response signal is received by the vehicle and the vehicle unlocks the doors.

[0015] To prevent such relay attacks, the door lock / unlock system according to this embodiment enables short-range communication between the vehicle and the wireless key device using Bluetooth (registered trademark) or the like. When the vehicle and the wireless key device are close to each other, they communicate via short-range communication. On the other hand, when the vehicle and the wireless key device are far from each other, they cannot communicate via short-range communication. Therefore, when the user is near the vehicle and a relay attack is unlikely to occur, the wireless key device receives an unlock signal and performs short-range communication with the vehicle. On the other hand, when the user is far from the vehicle and a relay attack is likely to occur, the wireless key device receives the unlock signal but does not perform short-range communication with the vehicle. The wireless key device according to this embodiment transmits a response signal in the former case and an activation signal in the latter case. Upon receiving the activation signal, the vehicle activates a security device. The security device, for example, captures an image of the vehicle's surroundings. By retaining the captured image of the vehicle's surroundings, relay attacks are prevented.

[0016] Even in situations where an unlock signal is received but short-range communication with the vehicle is not performed, the risk of a relay attack varies. For example, the risk of a relay attack is low in a parking lot of a commercial facility, where other shoppers are present near the vehicle. On the other hand, the risk of a relay attack is high in a parking lot at home or in an area where relay attacks are common. The door lock unlocking system according to this embodiment changes the operation time of the security device depending on the area where the unlock signal is received but short-range communication with the vehicle is not performed.

[0017] First, the operation of unlocking a door lock and the operation of causing a relay attack in the conventional door lock unlocking system 2000 will be described. FIGS. 1(a) and 1(b) show the configuration of a door lock unlocking system 2000 for comparison. FIG. 1(a) explains the operation of unlocking a door lock in the door lock unlocking system 2000. The door lock unlocking system 2000 includes a vehicle 2100, a wireless key device 2200, and a control device 2300. The vehicle 2100 is an automobile equipped with a door lock (not shown). The wireless key device 2200 is a wireless communication device carried by the user or driver of the vehicle 2100. The wireless key device 2200 is used to unlock the door lock.

[0018] The control device 2300 is mounted on the vehicle 2100 and controls the locking and unlocking of the doors. The control device 2300 has, for example, a transmission function using LF (Low Frequency) communication 10 and a reception function using UHF (Ultra High Frequency) communication 12. When a user touches the door handle of the vehicle 2100, the control device 2300 transmits an unlock signal using the LF communication 10.

[0019] The wireless key device 2200 has, for example, a receiving function via LF communication 10 and a transmitting function via UHF communication 12. The wireless key device 2200 receives an unlocking signal from the control device 2300 via the LF communication 10. When the wireless key device 2200 receives the unlocking signal, it transmits a response signal via the UHF communication 12. The control device 2300 receives the response signal via the UHF communication 12 from the wireless key device 2200. When the control device 2300 receives the response signal, it unlocks the doors of the vehicle 2100.

[0020] Fig. 1(b) shows the operation of a relay attack in the door lock unlocking system 2000. In Fig. 1(b), the distance between the vehicle 2100 and the wireless key device 2200 is greater than in Fig. 1(a), and LF communication 10 between the control device 2300 and the wireless key device 2200 is normally impossible. Therefore, unless a relay attack is performed, the doors of the vehicle 2100 will not be unlocked.

[0021] The suspicious person places a repeater 2500 between the vehicle 2100 and the wireless key device 2200. The repeater 2500 has a receiving function and a transmitting function via LF communication 10. When the suspicious person touches the door handle of the vehicle 2100, the control device 2300 transmits an unlock signal via LF communication 10. The repeater 2500 receives the unlock signal via LF communication 10 and transmits the unlock signal via LF communication 10. At that time, the repeater 2500 amplifies the unlock signal.

[0022] The wireless key device 2200 receives an unlock signal from the repeater 2500 via LF communication 10. Upon receiving the unlock signal, the wireless key device 2200 transmits a response signal via UHF communication 12. The distance over which the UHF communication 12 is possible is set longer than the distance over which the LF communication 10 is possible. The control device 2300 receives the response signal via UHF communication 12 from the wireless key device 2200. Upon receiving the response signal, the control device 2300 unlocks the doors of the vehicle 2100.

[0023] 2(a)-(b) show the configuration of the door lock unlocking system 1000. FIG. 2(a) explains the operation of unlocking a door in the door lock unlocking system 1000. The door lock unlocking system 1000 includes a vehicle 100, a wireless key device 200, a control device 300, and a security device 400. The vehicle 100 is an automobile equipped with a door lock (not shown). The wireless key device 200 is a wireless communication device carried by the user or driver of the vehicle 100. Like the wireless key device 2200, the wireless key device 200 is used to unlock the door lock.

[0024] The control device 300 is mounted on the vehicle 100 and controls the unlocking or locking of the doors. The control device 300 has, for example, a transmission function using LF communication 10, a receiving function using UHF communication 12, and a transmission / reception function for short-range communication 14. The transmission function using LF communication 10, the receiving function using UHF communication 12, and the transmission / reception function for short-range communication 14 in the control device 300 may also be referred to as the transmission function using LF communication 10, the receiving function using UHF communication 12, and the transmission / reception function for short-range communication 14 in the vehicle 100.

[0025] The short-range communication 14 is, for example, Bluetooth (registered trademark), but may also be a wireless LAN (Local Area Network). When the vehicle 100 and the wireless key device 200 are close to each other, for example, within several tens of meters, the control device 300 communicates with the wireless key device 200 via the short-range communication 14. When the user touches the door handle of the vehicle 100, the control device 300 transmits an unlock signal via the LF communication 10. The unlock signal is a signal for unlocking the doors of the vehicle 100.

[0026] Here, FIG. 3 will also be used to explain the wireless key apparatus 200. FIG. 3 shows the configuration of the wireless key apparatus 200. The wireless key apparatus 200 includes a communication unit 210, an acquisition unit 212, a receiving unit 220, a transmitting unit 222, a control unit 230, and a storage unit 240. The communication unit 210 has a communication function using short-range communication 14 and can communicate with the control device 300 (vehicle 100) via short-range communication 14. The receiving unit 220 has a reception function using LF communication 10 and can receive an unlocking signal from the control device 300 (vehicle 100) via LF communication 10. In the situation shown in FIG. 2(a), the communication unit 210 communicates with the control device 300 via short-range communication 14, and the receiving unit 220 receives the unlocking signal via LF communication 10.

[0027] The acquisition unit 212 receives signals from satellites of the Global Navigation Satellite System (GNSS) and performs positioning using the GNSS to acquire location information of the wireless key apparatus 200. The location information is expressed, for example, by latitude and longitude. The acquisition unit 212 may acquire map information corresponding to the location information from a mobile terminal such as a smartphone that the user carries together with the wireless key apparatus 200.

[0028] The storage unit 240 stores information on a first area, a second area, and a third area as areas corresponding to the location information. The storage unit 240 may store map information acquired from a mobile terminal such as a smartphone via the acquisition unit 212. The first area is an area where relay attacks do not occur. The first area is, for example, a parking lot of a large commercial facility, and the information on the first area is location information indicating the extent of the parking lot of the large commercial facility. In large commercial facilities, the distance from the parking lot to the sales floor where the user is located is long, and this distance is blocked by thick interior walls, making relay attacks unlikely to occur. Even if an amplified unlocking signal from a repeater of a suspicious person near the vehicle reaches the wireless key device, neither the response signal nor the activation signal will reach the vehicle.

[0029] The second area is an area where the risk is low even if a relay attack occurs. The second area is, for example, a parking lot of a small commercial facility, and the information about the second area is location information indicating the extent of the parking lot of the small commercial facility. In a small commercial facility, the user quickly returns to vehicle 100 or other shoppers are near vehicle 100, so any suspicious person will quickly escape. This reduces the risk when a relay attack occurs.

[0030] The third area is a region where there is a high risk if a relay attack occurs. The third area is, for example, a home parking lot or a region where relay attacks are frequent, and the information about the third area is location information that indicates the range of the home parking lot or the region where relay attacks are frequent, such as when sleeping late at night. In the home parking lot, it takes a long time to arrive at vehicle 100, so there is a high risk if a relay attack occurs. Here, whether the risk of a relay attack is "low" or "high" may be determined relatively.

[0031] The control unit 230 receives location information from the acquisition unit 212. The control unit 230 references the information on the first, second, and third areas stored in the storage unit 240 and determines whether the received location information is included in any of the first to third areas. The control unit 230 controls the transmission unit 222 depending on whether the receiving unit 220 receives an unlocking signal, whether the communication unit 210 is performing short-range communication 14, and whether the location information is included in any of the first to third areas. To this end, the control unit 230 references a table stored in the storage unit 240 based on whether the receiving unit 220 receives an unlocking signal, whether the communication unit 210 is performing short-range communication 14, and whether the location information is included in any of the first to third areas.

[0032] 4 shows the data structure of a table stored in the storage unit 240. When the receiving unit 220 receives an unlock signal via LF communication 10, and the communication unit 210 is communicating with the control device 300 via short-range communication 14, the control unit 230 determines to transmit a response signal to respond to the unlock signal. When the receiving unit 220 receives the unlock signal via LF communication 10, and the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is not included in the first, second, or third area, the control unit 230 determines to transmit a first activation signal. When the receiving unit 220 receives the unlock signal via LF communication 10, and the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is included in the second area, the control unit 230 determines to transmit a second activation signal.

[0033] The control unit 230 determines to transmit a third activation signal when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via near-field communication 14, and the location information is included in the third area. The control unit 230 determines not to transmit the first activation signal, the second activation signal, or the third activation signal when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via near-field communication 14, and the location information is included in the first area. Here, the first activation signal is a signal for operating the security device 400 for a first period, the second activation signal is a signal for operating the security device 400 for a second period, and the third activation signal is a signal for operating the security device 400 for a third period. The second period is shorter than the first period, and the third period is longer than the first period. Furthermore, the control unit 230 determines not to transmit any of the response signal and the first to third activation signals if the receiving unit 220 does not receive an unlock signal through the LF communication 10. Return to FIG.

[0034] 2(a), the control unit 230 decides to transmit a response signal. The transmitting unit 222 transmits the response signal via UHF communication 12 in accordance with the decision of the control unit 230. If the LF communication 10 is called the first wireless communication method and the short-range communication 14 is called the second wireless communication method, the UHF communication 12 is called the third wireless communication method. When the control device 300 receives the response signal, it unlocks the doors of the vehicle 100.

[0035] Figure 2(b) shows the operation of an attempted relay attack on the door lock unlocking system 1000. In Figure 2(b), the distance between the vehicle 100 and the wireless key device 200 is greater than in Figure 2(a), and LF communication 10 between the control device 300 and the wireless key device 200 is normally impossible. In addition, the distance over which short-range communication 14 is possible is shorter than the distance over which LF communication 10 is possible, so short-range communication 14 between the control device 300 and the wireless key device 200 is impossible.

[0036] A suspicious person places a repeater 500 between the vehicle 100 and the wireless key device 200. The repeater 500 has a receiving function and a transmitting function via LF communication 10. When the suspicious person touches the door handle of the vehicle 100, the control device 300 transmits an unlock signal via LF communication 10. The repeater 500 receives the unlock signal via LF communication 10 and transmits the unlock signal via LF communication 10. At that time, the repeater 500 amplifies the unlock signal.

[0037] The receiver 220 of the wireless key apparatus 200 receives an unlock signal from the repeater 500 via LF communication 10. Meanwhile, the communication unit 210 is not communicating with the control device 300 via short-range communication 14. The acquirer 212 acquires location information of the wireless key apparatus 200, and the control unit 230 determines whether the location information is included in any of the first, second, or third areas. In this situation, the control unit 230 refers to the table in the storage unit 240 and determines whether to transmit the first activation signal, the second activation signal, the third activation signal, or not to transmit the first activation signal or the third activation signal. For example, the control unit 230 determines to transmit the first activation signal. The transmitter 222 transmits the first activation signal via UHF communication 12 in accordance with the determination made by the control unit 230.

[0038] When the control device 300 receives the first activation signal via UHF communication 12, it notifies the security device 400 of the content of the first activation signal. The content of the first activation signal is an instruction to operate the security device 400 for a first period. The security device 400 includes, for example, a surveillance camera and a DVR (Digital Video Recorder) mounted on the vehicle 100. When the security device 400 receives from the control device 300 an instruction to operate the security device 400 for a first period as the content of the first activation signal, it causes the DVR to record video captured by the surveillance camera for the first period. The security device 400 is also capable of outputting an alarm, and may output an alarm for the first period when it receives from the control device 300 an instruction to operate the security device 400 for a first period as the content of the first activation signal.

[0039] The same processing is performed when control unit 230 decides to transmit a second activation signal, and security device 400 causes the DVR to record video captured by the surveillance camera for a second period of time and outputs an alarm for a second period of time. The same processing is performed when control unit 230 decides to transmit a third activation signal, and security device 400 causes the DVR to record video captured by the surveillance camera for a third period of time and outputs an alarm for a third period of time. If control unit 230 decides not to transmit a third activation signal from the first activation signal, security device 400 does not operate.

[0040] This configuration can be realized in hardware terms by the CPU, memory, and other LSIs of any computer, and in software terms by programs loaded into memory, but here we depict functional blocks realized by the cooperation of these. Therefore, it will be understood by those skilled in the art that these functional blocks can be realized in various forms using only hardware, only software, or a combination of both.

[0041] The operation of the wireless key apparatus 200 configured as described above will now be described. Figure 5 is a flowchart showing the transmission procedure by the wireless key apparatus 200. If the receiver 220 receives an unlock signal (Y in S10), and if the communication unit 210 is performing short-range communication 14 (Y in S12), the transmitter 222 transmits a response signal (S14). If the communication unit 210 is not performing short-range communication 14 (N in S12), and if the area is within the first area (Y in S16), the transmitter 222 does not transmit a response signal or an activation signal (S18). If the area is not within the first area (N in S16) or is within the second area (Y in S20), the transmitter 222 transmits a second activation signal (S22). If the area is not within the second area (N in S20) or is within the third area (Y in S24), the transmitter 222 transmits a third activation signal (S26). If the area is not included in the third area (N in S24), the transmitter 222 transmits the first activation signal (S28). If the receiver 220 does not receive the unlock signal (N in S10), the transmitter 222 does not transmit the response signal or activation signal (S30).

[0042] (Variation) Next, a modified example will be described. The modified example relates to the door lock unlocking system 1000 similar to the previous example. As described above, the third area is predefined as a region that poses a high risk in the event of a relay attack. However, even in a location not defined as the third area, a situation may occur in which the receiving unit 220 receives an unlocking signal but the communication unit 210 does not communicate with the control device 300 via short-range communication 14. The modified example relates to a process for adding a location where such a situation has occurred to the third area. Here, the differences from the previous example will be mainly described.

[0043] Fig. 6 shows the configuration of a wireless key apparatus 200 according to a modified example. Compared to Fig. 3, the wireless key apparatus 200 includes a server communication unit 214. The server communication unit 214 has a communication function compatible with, for example, a mobile phone system or a wireless LAN, and can communicate with a server (not shown) by connecting to a network. As long as the communication unit 210 can communicate with the server, the server communication unit 214 does not have to be included in the wireless key apparatus 200.

[0044] The control unit 230 executes the same processing as before when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is not included in the third area. That is, the control unit 230 determines to transmit a first activation signal when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is not included in the first, second, or third area. The control unit 230 determines to transmit a second activation signal when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is included in the second area. The control unit 230 decides not to transmit the first activation signal, the second activation signal, or the third activation signal when the receiving unit 220 receives an unlock signal via LF communication 10, the communication unit 210 is not communicating with the control device 300 via short-range communication 14, and the location information is included in the first area.

[0045] Furthermore, when the receiving unit 220 receives an unlock signal via LF communication 10 and the communication unit 210 is not communicating with the control device 300 via short-range communication 14, if the location information is not included in the first area, second area, or third area, the control unit 230 generates a request signal to request the addition of the third area. The request signal includes the location information acquired by the acquisition unit 212. The server communication unit 214 transmits the request signal to the server.

[0046] When the server receives the request signal, it adds the location information included in the request signal to the third area. At that time, a certain range including the location information may be added to the third area. The server transmits the updated information of the third area to the wireless key device 200. When the server communication unit 214 of the wireless key device 200 receives the updated information of the third area from the server, it stores the updated information of the third area in the memory unit 240. When the number of request signals for each piece of location information received from multiple wireless key devices 200 exceeds a threshold, the server may add the location information to the third area. The number of request signals exceeding the threshold means that the location is an area where relay attacks frequently occur.

[0047] According to this embodiment, when an unlock signal is received via LF communication, if communication with the vehicle is established via short-range communication, a response signal is transmitted; if communication with the vehicle is not established via short-range communication, one of the activation signals is transmitted to the vehicle, thereby enabling the security device to be activated when there is a possibility of a relay attack. Furthermore, because the security device is activated when there is a possibility of a relay attack, the actions of a suspicious person can be recorded. Furthermore, because the actions of a suspicious person are recorded, relay attacks can be suppressed. Furthermore, when an unlock signal is received via LF communication but communication with the vehicle is not established via short-range communication, the activation signal is changed depending on the area in which the wireless key device is located, allowing the operation time of the security device to be changed depending on the area.

[0048] In addition, because the operation time of the security device is changed depending on the area, the security device can be operated for a period appropriate for the risk of a relay attack.In addition, because the security device is operated for a period appropriate for the risk of a relay attack, the security device can be operated efficiently.In addition, if the location information when an unlocking signal is received via LF communication but communication with the vehicle via short-range communication is not included in the first, second, or third area, the location is updated to include the third area, thereby improving the accuracy of the third area setting.

[0049] The present invention has been described above based on the embodiments. These embodiments are merely examples, and it will be understood by those skilled in the art that various modifications are possible in the combination of the components and treatment processes, and that such modifications are also within the scope of the present invention. [Explanation of symbols]

[0050] 100 Vehicle, 200 Wireless key device, 210 Communication unit, 212 Acquisition unit, 214 Server communication unit, 220 Receiving unit, 222 Transmitting unit, 230 Control unit, 240 Memory unit, 300 Control device, 400 Security device, 500 Repeater, 10002000 Door lock unlocking system.

Claims

1. an acquisition unit that acquires location information; a storage unit that stores information on a first area, a second area, and a third area corresponding to the location information; a receiving unit capable of receiving an unlocking signal for unlocking a door lock of a vehicle from the vehicle by a first wireless communication method; a communication unit capable of communicating with the vehicle by a second wireless communication method different from the first wireless communication method; a transmitting unit configured to transmit a response signal to the vehicle in response to the unlocking signal if the receiving unit receives the unlocking signal by the first wireless communication method and the communication unit is communicating with the vehicle by the second wireless communication method; When the receiving unit receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is not included in the first area, the second area, or the third area, the transmitting unit transmits a first activation signal to the vehicle to operate a security device mounted on the vehicle for a first period of time, When the receiving unit receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is included in the second area, the transmitting unit transmits a second activation signal to the vehicle to operate the security device for a second period shorter than the first period; When the receiving unit receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is included in the third area, the transmitting unit transmits a third activation signal to the vehicle to operate the security device for a third period longer than the first period; When the receiving unit receives the unlock signal via the first wireless communication method and the communication unit is not communicating with the vehicle via the second wireless communication method, the transmitting unit does not transmit the first activation signal, the second activation signal, or the third activation signal if the location information is included in the first area.

2. further comprising a server communication unit capable of communicating with the server; the server communication unit, when the receiving unit receives the unlock signal by the first wireless communication method and the communication unit is not communicating with the vehicle by the second wireless communication method, if the location information is not included in the first area, the second area, or the third area, transmits the location information to the server to add the location information to the third area; 2. The wireless key device according to claim 1, wherein the server communication unit, when receiving updated information about the third area from the server, stores the updated information about the third area in the storage unit.

3. 3. The wireless key device according to claim 2, wherein the updated information of the third area is information in which, when the number of pieces of location information received by the server from the plurality of wireless key devices exceeds a threshold, the number of pieces of location information that exceed the threshold is added to the third area.

4. a vehicle equipped with a door lock; a wireless key device used to unlock the door lock, the wireless key device is capable of acquiring location information and stores information on a first area, a second area, and a third area for the location information; the vehicle transmits an unlock signal for unlocking a door lock of the vehicle by a first wireless communication system; the vehicle and the wireless key device are capable of communicating with each other by a second wireless communication method different from the first wireless communication method; When the wireless key device receives the unlock signal via the first wireless communication method, if the wireless key device is communicating with the vehicle via the second wireless communication method, the wireless key device transmits a response signal to the vehicle in response to the unlock signal; the wireless key device receives the unlock signal by the first wireless communication method and is not communicating with the vehicle by the second wireless communication method, and if the location information is not included in the first area, the second area, or the third area, transmits a first activation signal to the vehicle to activate a security device mounted on the vehicle for a first period; When the wireless key device receives the unlock signal via the first wireless communication method and is not communicating with the vehicle via the second wireless communication method, if the location information is included in the second area, the wireless key device transmits a second activation signal to the vehicle to operate the security device for a second period shorter than the first period; When the wireless key device receives the unlock signal via the first wireless communication method and is not communicating with the vehicle via the second wireless communication method, if the location information is included in the third area, the wireless key device transmits a third activation signal to the vehicle to operate the security device for a third period longer than the first period; When the wireless key device receives the unlock signal via the first wireless communication method and is not communicating with the vehicle via the second wireless communication method, if the location information is included in the first area, the wireless key device does not transmit the first activation signal, the second activation signal, or the third activation signal.

5. An unlocking method for a wireless key device that can acquire location information and stores information on a first area, a second area, and a third area for the location information, comprising: receiving an unlock signal for unlocking a door lock of a vehicle from the vehicle by a first wireless communication method; a step of being able to communicate with the vehicle by a second wireless communication system different from the first wireless communication system; When the unlocking signal is received by the first wireless communication method, if communication with the vehicle is being performed by the second wireless communication method, transmitting a response signal to the vehicle for responding to the unlocking signal; a step of transmitting a first activation signal to the vehicle to operate a security device mounted on the vehicle for a first period if the unlock signal is received by the first wireless communication method and communication with the vehicle is not being performed by the second wireless communication method, and the location information is not included in the first area, the second area, or the third area; transmitting a second activation signal to the vehicle to operate the security device for a second period shorter than the first period if the location information is included in the second area when the security device receives the unlock signal via the first wireless communication method and is not communicating with the vehicle via the second wireless communication method; transmitting a third activation signal to the vehicle to operate the security device for a third period longer than the first period if the location information is included in the third area when the security device receives the unlock signal via the first wireless communication method and is not communicating with the vehicle via the second wireless communication method; An unlocking method in which, when the unlocking signal is received via the first wireless communication method and communication with the vehicle is not being performed via the second wireless communication method, if the location information is included in the first area, the first activation signal, the second activation signal, and the third activation signal are not transmitted.

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