Smart community silver hair guard card and system thereof

Abstract

The invention relates to a smart community bank card and a system thereof, and belongs to the technical field of communication interaction. The invention discloses an intelligent community bank card guard card system, which comprises a call module, an NFC (Near Field Communication) integrated module, a WIFI (Wireless Fidelity) module and a positioning module which are arranged in a guard card, the system further comprises an external community WiFi network, an RFID card reader, an access control card reader and a central manager. The call module is used for supporting an SI P call function through a built-in LTE.CAT.1 communication module; the NFC integrated module comprises an RF ID module and an access control card; the RFID module is used for sending label information to the RFID card reader; and the WIFI module is used for scanning or connecting a community WiFi network. According to the invention, the traditional camera monitoring technology is abandoned, RFID, access control, WiFi and GPS / Beidou positioning are combined, the multi-mode fusion positioning technology improves the full coverage and precision of positioning in a community, and emergency rescue is facilitated.

Description

Technical Field

[0001] The present invention belongs to the field of communication interaction technology, and in particular, relates to a smart community silver-haired guardian card and a system thereof. Background Art

[0002] Silver-haired group protection devices are a series of smart products and services designed for the elderly, aiming to improve their quality of life, provide security and facilitate their daily lives. Some common silver-haired group protection devices include:

[0003] Community Guardian Kit: including video monitoring, door magnetic induction, active calling, SOS one-button alarm and other equipment, used to monitor the safety of the elderly. Once an abnormality is detected or the elderly actively ask for help, the information will be fed back to the background immediately and the community management staff will be notified.

[0004] Health monitoring: Devices such as smart bracelets can monitor the health status and location information of the elderly in real time, and synchronize the data to mobile phone apps, making it convenient for community managers to view at any time.

[0005] It can be seen that traditional elderly care equipment mainly relies on video surveillance technology and smart wearable GPS / Beidou positioning. Although these methods can provide real-time video monitoring and positioning, they have the following shortcomings:

[0006] First, the coverage of the whole community by cameras to monitor the lives of the elderly is likely to cause privacy concerns. Many elderly people find it difficult to accept this all-weather monitoring method. In addition, the monitoring range of cameras is limited, the cost of laying a large number of cameras is high, and data extraction and analysis still require a lot of manpower and computing power costs, which greatly reduces the monitoring effect.

[0007] Second, the response speed and accuracy of GPS / Beidou positioning in emergency situations are limited, and it is impossible to quickly and accurately locate the specific building and floor location of the elderly, affecting the efficiency of emergency rescue. Summary of the invention

[0008] In order to solve the privacy issues, high costs and technical problems of GPS / Beidou positioning accuracy that cannot cover the specific buildings and floors of the entire community, affecting the efficiency of emergency rescue, the present invention provides a smart community silver-haired guardian card and its system; it combines multi-modal fusion positioning technologies such as RFID, access control, WiFi and GPS / Beidou positioning to achieve more comprehensive and efficient protection.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A smart community silver-haired guardian card, mainly composed of the following components: CPU chip, memory, LTE.CAT.1 communication module, antenna module, audio codec, display screen, button, battery and power management module, used to realize basic call functions;

[0011] It also includes an NFC module for realizing the all-in-one card function; and a shell for protecting the internal devices and giving it the appearance of a bank card.

[0012] A smart community silver-haired guardian card system, including a built-in call module, an NFC integrated module, a WIFI module and a positioning module in the guardian card; and also includes an external community WiFi network point, an RFID card reader, an access control card reader and a central manager;

[0013] The call module supports SIP call function through built-in LTE.CAT.1 communication module;

[0014] NFC integrated modules include RFID modules and access control cards;

[0015] The RFID module is used to send tag information to the RFID reader to identify and locate the cardholder's tag in the public area of ​​the community;

[0016] The access control card is used to send tag information to the access control card reader to verify the tag when the cardholder enters or exits;

[0017] The WIFI module is used to scan or connect to community WiFi points to achieve accurate community building positioning or stable data transmission; the community WiFi points are arranged in various places in the building;

[0018] The positioning module is used for positioning outside the community, and obtains the geographical plane location of the cardholder based on the GPS / Beidou positioning system;

[0019] The RFID readers are arranged at different locations in the community, and each reader can read the information of nearby RFID tags and record the location information;

[0020] The access control card readers are arranged at each entrance and exit of the community to realize tag recognition and record management of access control cards when entering and exiting;

[0021] The central manager is used to receive tag information and location information transmitted by each RFID card reader, access control card reader and community WiFi network point, and perform data analysis and processing;

[0022] The guard card system has the functions of positioning within the community, positioning within the building and calculating the movement trajectory within the community.

[0023] Preferably, the RFID card reader uses an ultra-high frequency (UHF) RFID radio frequency signal with a signal receiving range of less than 6 meters; the access control card reader uses a low-frequency radio frequency signal with a signal receiving range of less than 1 meter;

[0024] Preferably, the steps for implementing the intra-cell positioning function include:

[0025] Multiple RFID readers are arranged in the cell, and each reader can read the tag information of the nearby RFID module.

[0026] When the RFID module enters the reading range of the RFID reader, the reader will record the tag information and location information of the RFID module and upload it to the central manager;

[0027] The central manager verifies and determines the cardholder's identity and location based on the data uploaded by the RFID reader.

[0028] Preferably, the steps for implementing the intra-building positioning function include:

[0029] Scan the hotspots of the community WiFi network points in each building and on each floor one by one, and record the hotspot names and building locations of all community WiFi network points;

[0030] Build a database of hotspot names and building locations;

[0031] The Guardian Card uses a built-in WiFi module to scan the surrounding WiFi hotspots and record the hotspot names;

[0032] By matching the WiFi hotspot name scanned by the Guardian Card with the database, the cardholder's building location, i.e. the building and floor, can be inferred.

[0033] Preferably, the steps for implementing the intra-cell mobile trajectory estimation function include:

[0034] Install RFID readers at key locations within the community and access control readers at entrances, corridors, and stairwells within the community; ensure that all devices can be stably connected to the central manager and can upload data in real time or periodically;

[0035] When the NFC integrated module of the Guardian Card is close to the RFID reader or access control reader, the device will automatically record the RFID tag, time and location, and upload the data to the central manager;

[0036] The central manager uses data processing algorithms to analyze all locations and times that the cardholder has passed in the recent period of time and calculate the movement trajectory.

[0037] Preferably, the NFC integrated module also includes an electronic wallet module for binding WeChat Pay or Alipay to realize payment transactions;

[0038] Preferably, the NFC integrated module also includes a community canteen meal card and a community life payment card, and encryption technology is used to implement encrypted payment transactions;

[0039] Preferably, the implementation steps of the encryption technology include:

[0040] S1) Dynamic encryption factor generation:

[0041] When each transaction or access request is initiated, a random number is generated using the tag of the RFID module and the tag of the CPU card; the CPU card includes a community canteen meal card and a community life payment card;

[0042] Introducing microsecond-level timestamps as dynamic factors to ensure that each generated encryption factor is timely and prevent replay attacks;

[0043] The RFID module and CPU card both store their own unique tags, which are combined with random numbers and timestamps to generate dynamic encryption factors;

[0044] S2) Interaction and fusion of dynamic encryption factors:

[0045] When conducting a transaction or accessing, the card reader first reads the tag data of the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the back-end system to ensure the confidentiality and integrity of data transmission;

[0046] The information read by the card reader includes the dynamic encryption factor of the CPU card, the dynamic encryption factor of the RFID module, and other necessary identity authentication information;

[0047] In the back-end system, a fusion algorithm is designed to fuse the dynamic encryption factors from the CPU card and the RFID module to generate the final dynamic encryption key;

[0048] S3) Encryption and Decryption:

[0049] The payment data is processed using an encryption algorithm using the generated dynamic encryption key and securely transmitted to the payee. The decryption process at the payee requires the same algorithm to be used at the receiving end to complete a payment transaction.

[0050] Preferably, the implementation steps of the encryption technology also include:

[0051] S4) Data integrity verification:

[0052] Add a message authentication code (MAC) or digital signature to the data; verify data integrity while encrypting using a dynamic encryption factor; ensure that data has not been tampered with during transmission and storage;

[0053] S5) Key update frequency:

[0054] Determine the update frequency of dynamic encryption keys based on the system's security requirements and performance limitations;

[0055] S6) Secure Storage:

[0056] The data of random number generators, timestamp records and unique tags in RFID modules and CPU cards should be stored securely; physical security measures (such as tamper-proof packaging) and encrypted storage technology should be used to protect key data to prevent illegal reading or tampering.

[0057] Preferably, in step S2), the specific calculation process of the fusion algorithm includes:

[0058] The dynamic encryption factors generated by the CPU card and the RFID module are concatenated to form a new input string;

[0059] Use the SHA-256 hash function to hash the concatenated string to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as:

[0060] K=H(F CPU ||F RFID )

[0061] Where K represents the dynamic encryption key,

[0062] F CPU and F RFID They are the dynamic encryption factors of the CPU card and the RFID module respectively; || indicates the connection operation;

[0063] Preferably, in step S3), the encryption algorithm is an AES symmetric encryption algorithm or an RSA asymmetric encryption algorithm.

[0064] Beneficial effects of the present invention:

[0065] 1. The present invention abandons traditional video surveillance technology and innovatively combines RFID, access control, WiFi and GPS / Beidou positioning. The multimodal fusion positioning technology improves the full coverage and accuracy of positioning within the community, facilitating emergency rescue.

[0066] 2. The Guardian Card uses the integrated technology of the NFC module to cover electronic wallets, community canteen meal cards, community life payment cards, etc., providing comprehensive services for the elderly and improving their living convenience.

[0067] 3. The use of encryption technology ensures the security of the payment transaction process of the NFC module, improving the property safety and personal information security of the elderly. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0069] Figure 1 This is a display diagram of a smart community silver-haired guardian card of the present invention.

[0070] Figure 2 This is a modular structural block diagram of a smart community silver-haired guardian card system of the present invention.

[0071] Figure 3 The present invention is a flow chart of encryption technology in a smart community silver-haired guardian card system. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0073] See also Figure 1 As shown, a smart community silver-haired guardian card is mainly composed of the following components: CPU chip, memory, LTE.CAT.1 communication module, antenna module, audio codec, display screen, button, battery and power management module, which is used to realize basic call functions;

[0074] It also includes an NFC module for realizing the all-in-one card function; and a shell for protecting the internal devices and giving it the appearance of a bank card.

[0075] Specifically, the guardian card of the present invention integrates SIP calling, community card and other functions into a low-power device based on LTE.CAT.1 module, and is equipped with a power supply and a shell, so that it has mobile phone calling function, long battery life and a bank card-like appearance. It can significantly improve the convenience of life of the elderly and improve their quality of life.

[0076] See also Figure 2 and Figure 3As shown, a smart community silver-haired guardian card system includes a built-in call module, an NFC integrated module, a WIFI module and a positioning module in the guardian card; and also includes an external community WiFi network point, an RFID reader, an access control reader and a central manager;

[0077] The call module supports SIP call function through built-in LTE.CAT.1 communication module;

[0078] NFC integrated modules include RFID modules and access control cards;

[0079] The RFID module is used to send tag information to the RFID reader to identify and locate the cardholder's tag in the public area of ​​the community;

[0080] The access control card is used to send tag information to the access control card reader to verify the tag when the cardholder enters or exits;

[0081] The WIFI module is used to scan or connect to community WiFi points to achieve accurate community building positioning or stable data transmission; the community WiFi points are arranged in various places in the building;

[0082] The positioning module is used for positioning outside the community, and obtains the geographical plane location of the cardholder based on the GPS / Beidou positioning system;

[0083] The RFID readers are arranged at different locations in the community, and each reader can read the information of nearby RFID tags and record the location information;

[0084] The access control card readers are arranged at each entrance and exit of the community to realize tag recognition and record management of access control cards when entering and exiting;

[0085] The central manager is used to receive tag information and location information transmitted by various RFID readers, access control readers and community WiFi network points; and perform data analysis and processing.

[0086] The guard card system has the functions of positioning within the community, positioning within the building and calculating the movement trajectory within the community.

[0087] Specifically, by integrating the three positioning methods of RFID module, access card and WiFi module, different environments and accuracy requirements can be met respectively. RFID is used for large-scale positioning within the community; access card and WiFi are used for precise positioning within the building. The three complement each other and cover all location scenarios in the community. And the GPS / Beidou positioning module is used for positioning outside the community to provide more comprehensive location information. The integration of multiple positioning technologies improves the reliability of positioning and reduces the risk of failure of a single technology. In an emergency, the system can quickly locate the elderly and provide key information for rescue, thereby improving rescue efficiency and saving lives.

[0088] The combination of three positioning technologies plays a key role in the smart community silver guardian card system, effectively improving the safety and convenience of the elderly, and providing data support for community management and service optimization. The mobile trajectory calculation function can not only understand the location of the elderly in real time, but also help analyze their activity patterns, providing data support for community service optimization, such as identifying high-risk areas or adjusting the layout of community service facilities. The central manager can monitor and manage the entry and exit of people in the community in real time to ensure safe and efficient management.

[0089] Furthermore, the RFID card reader uses an ultra-high frequency (UHF) RFID radio frequency signal, and the signal receiving range is within 6 meters; the access control card reader uses a low-frequency radio frequency signal, and the signal receiving range is within 1 meter;

[0090] Furthermore, the steps for implementing the intra-cell positioning function include:

[0091] Multiple RFID readers are arranged in the cell, and each reader can read the tag information of the nearby RFID module.

[0092] When the RFID module enters the reading range of the RFID reader, the reader will record the tag information and location information of the RFID module and upload it to the central manager;

[0093] The central manager verifies and determines the cardholder's identity and location based on the data uploaded by the RFID reader.

[0094] Furthermore, the steps for implementing the positioning function within the building include:

[0095] Scan the hotspots of the community WiFi network points in each building and on each floor one by one, and record the hotspot names and building locations of all community WiFi network points;

[0096] Build a database of hotspot names and building locations;

[0097] The Guardian Card uses a built-in WiFi module to scan the surrounding WiFi hotspots and record the hotspot names;

[0098] The central manager matches the WiFi hotspot name scanned by the guardian card with the database to calculate the cardholder's building location, that is, the building and floor.

[0099] Furthermore, the steps for implementing the intra-cell mobile trajectory estimation function include:

[0100] Install RFID readers at key locations within the community and access control readers at entrances, corridors, and stairwells within the community; ensure that all devices can be stably connected to the central manager and can upload data in real time or periodically;

[0101] When the NFC integrated module of the Guardian Card is close to the RFID reader or access control reader, the device will automatically record the RFID tag, time and location, and upload the data to the central manager;

[0102] The central manager uses data processing algorithms to analyze all locations and times that the cardholder has passed in the recent period of time and calculate the movement trajectory.

[0103] Specifically, the present invention does not monitor the activities and tracks of the elderly by means of surveillance cameras, and thus well maintains the privacy of the elderly. The cardholder's position is only located through the RFID tag of the NFC integrated module held by the elderly, and the activity range and activity status of the elderly are reversely inferred, so that the elderly can be protected without being objectionable. The guardian card of the present invention is useful for the elderly and others:

[0104] In daily working state: data transmission and storage are processed with multiple encryptions, and only children with the permission of their elders have the right to access the data and receive alert information push.

[0105] SOS call status: When the elderly initiate a call for help, the system automatically exits the low-power mode, updates the elderly's location in real time, and pushes the location to community staff and search and rescue personnel. After the call for help ends, the system automatically resumes the low-power mode and stops updating the elderly's real-time location.

[0106] Furthermore, the NFC integrated module also includes an electronic wallet module for binding WeChat Pay or Alipay to realize payment transactions;

[0107] Furthermore, the NFC integrated module also includes a community canteen meal card and a community life payment card, and encryption technology is used to implement encrypted payment transactions;

[0108] Specifically, the Guardian Card system integrates multiple functions, including calls, NFC payment (electronic wallet, community canteen meal card, community life payment card), access control, positioning, etc., to provide convenient community life services for the elderly. It can significantly improve the convenience of life for the elderly and improve their quality of life.

[0109] Furthermore, the implementation steps of the encryption technology include:

[0110] S1) Dynamic encryption factor generation:

[0111] When each transaction or access request is initiated, a random number is generated using the tag of the RFID module and the tag of the CPU card; the CPU card includes a community canteen meal card and a community life payment card;

[0112] Introducing microsecond-level timestamps as dynamic factors to ensure that each generated encryption factor is timely and prevent replay attacks;

[0113] In the specific implementation process, you can consider using hardware timestamps and combining them with security counters to ensure their uniqueness and unpredictability.

[0114] The RFID module and CPU card both store their own unique tags, which are combined with random numbers and timestamps to generate dynamic encryption factors;

[0115] S2) Interaction and fusion of dynamic encryption factors:

[0116] When a transaction or access is made, the card reader first reads the tag data (i.e., unique ID) of the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the back-end system to ensure the confidentiality and integrity of data transmission;

[0117] The information read by the card reader includes the dynamic encryption factor of the CPU card, the dynamic encryption factor of the RFID module, and other necessary identity authentication information;

[0118] In the back-end system, a fusion algorithm is designed to fuse the dynamic encryption factors from the CPU card and the RFID module to generate the final dynamic encryption key;

[0119] S3) Encryption and Decryption:

[0120] The payment data is processed using an encryption algorithm using the generated dynamic encryption key and securely transmitted to the payee. The decryption process at the payee requires the same algorithm to be used at the receiving end to complete a payment transaction.

[0121] Furthermore, the implementation steps of the encryption technology also include:

[0122] S4) Data integrity verification:

[0123] Add a message authentication code (MAC) or digital signature to the data; verify data integrity while encrypting using a dynamic encryption factor; ensure that data has not been tampered with during transmission and storage;

[0124] S5) Key update frequency:

[0125] Determine the update frequency of dynamic encryption keys based on the system's security requirements and performance limitations;

[0126] S6) Secure Storage:

[0127] The data of random number generators, timestamp records and unique tags in RFID modules and CPU cards should be stored securely; physical security measures (such as tamper-proof packaging) and encrypted storage technology should be used to protect key data to prevent illegal reading or tampering.

[0128] Specifically, the timestamp and dynamic key mechanism adopted by the present invention effectively prevent replay attacks. The secure key generation and storage mechanism, as well as the use of fusion algorithms, improve the security of the key and increase the difficulty of cracking. The data integrity verification mechanism effectively prevents data tampering during transmission and storage. The encryption technology solution ensures the security of the system, improves the property safety and personal information security of the elderly, and can be safely applied to application terminals for various payment transactions.

[0129] Further, in step S2), the specific calculation process of the fusion algorithm includes:

[0130] The dynamic encryption factors generated by the CPU card and the RFID module are concatenated to form a new input string;

[0131] Use the SHA-256 hash function to hash the concatenated string to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as:

[0132] K=H(F CPU ||F RFID )

[0133] Where K represents the dynamic encryption key,

[0134] F CPU and F RFID They are the dynamic encryption factors of the CPU card and the RFID module respectively; || indicates the connection operation;

[0135] Furthermore, in step S3), the encryption algorithm is an AES symmetric encryption algorithm or an RSA asymmetric encryption algorithm.

[0136] In summary, the present invention provides a smart community silver-haired guardian card and its system, which is a comprehensive elderly care and security platform based on multimodal data fusion, dynamic encryption and centralized management; it can realize accurate positioning, identity authentication, secure payment and convenient life services for the elderly.

[0137] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, modules and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0138] In the several embodiments provided in the present application, it should be understood that the disclosed systems, processes and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of modules, which can be electrical, mechanical or other forms.

[0139] In addition, each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0140] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, read-only memory), random access memory (RAM, random access memory), disk or optical disk and other media that can store program code.

[0141] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0142] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A smart community silver guardian card system, characterized by: It includes built-in call module, NFC integrated module, WIFI module and positioning module of the Guardian Card; it also includes external community WiFi network points, RFID card readers, access control card readers and central managers; The call module supports SIP call function through built-in LTE.CAT.1 communication module; NFC integrated modules include RFID modules and access control cards; The RFID module is used to send tag information to the RFID reader to identify and locate the cardholder's tag in the public area of ​​the community; The access control card is used to send tag information to the access control card reader to verify the tag when the cardholder enters or exits; The WIFI module is used to scan or connect to community WiFi points to achieve accurate community building positioning or stable data transmission; the community WiFi points are arranged in various places in the building; The positioning module is used for positioning outside the community, and obtains the geographical plane location of the cardholder based on the GPS / Beidou positioning system; The RFID readers are arranged at different locations in the community, and each reader can read the information of nearby RFID tags and record the location information; The access control card readers are arranged at each entrance and exit of the community to realize tag recognition and record management of access control cards when entering and exiting; The central manager is used to receive tag information and location information transmitted by each RFID card reader, access control card reader and community WiFi network point, and perform data analysis and processing; The guard card system has the functions of positioning within the community, positioning within the building and calculating the movement trajectory within the community.

2. A smart community silver guardian card system according to claim 1, characterized in that: The RFID card reader uses an ultra-high frequency RFID radio frequency signal; the access control card reader uses a low frequency radio frequency signal.

3. A smart community silver guardian card system according to claim 1, characterized in that: The steps for implementing the intra-cell positioning function include: Multiple RFID readers are arranged in the community, each reader can read the tag information of the nearby RFID module; When the RFID module enters the reading range of the RFID reader, the reader will record the tag information and location information of the RFID module and upload it to the central manager; The central manager verifies and determines the cardholder's identity and location based on the data uploaded by the RFID reader.

4. A smart community silver guardian card system according to claim 1, characterized in that: The steps for implementing the positioning function in the building include: Scan the hotspots of the community WiFi network points in each building and on each floor one by one, and record the hotspot names and building locations of all community WiFi network points; Build a database of hotspot names and building locations; The Guardian Card uses a built-in WiFi module to scan the surrounding WiFi hotspots and record the hotspot names; By matching the WiFi hotspot name scanned by the Guardian Card with the database, the cardholder's building location, i.e. the building and floor, can be inferred.

5. A smart community silver guardian card system according to claim 1, characterized in that: The steps for implementing the intra-cell mobile trajectory estimation function include: Install RFID readers at key locations within the community and access control readers at entrances, corridors, and stairwells within the community; ensure that all devices can be stably connected to the central manager and can upload data in real time or periodically; When the NFC integrated module of the Guardian Card is close to the RFID reader or access control reader, the device will automatically record the RFID tag, time and location, and upload the data to the central manager; The central manager uses data processing algorithms to analyze all locations and times that the cardholder has passed in the recent period of time and calculate the movement trajectory.

6. A smart community silver guardian card system according to claim 1, characterized in that: The NFC integrated module also includes an electronic wallet module for binding WeChat Pay or Alipay to realize payment transactions.

7. A smart community silver guardian card system according to claim 1, characterized in that: The NFC integrated module also includes a community canteen meal card and a community life payment card, and uses encryption technology to implement encrypted payment transactions.

8. A smart community silver guardian card system according to claim 7, characterized in that: The implementation steps of the encryption technology include: S1) Dynamic encryption factor generation: When each transaction or access request is initiated, a random number is generated using the tag of the RFID module and the tag of the CPU card; the CPU card includes a community canteen meal card and a community life payment card; Introducing microsecond-level timestamps as dynamic factors to ensure that each generated encryption factor is timely; The RFID module and CPU card both store their own unique tags, which are combined with random numbers and timestamps to generate dynamic encryption factors; S2) Interaction and fusion of dynamic encryption factors: When a transaction or access is made, the card reader first reads the tag data of the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the back-end system; The information read by the card reader includes the dynamic encryption factor of the CPU card, the dynamic encryption factor of the RFID module, and other necessary identity authentication information; In the back-end system, a fusion algorithm is designed to fuse the dynamic encryption factors from the CPU card and the RFID module to generate the final dynamic encryption key; S3) Encryption and Decryption: The payment data is processed using an encryption algorithm using the generated dynamic encryption key and securely transmitted to the payee. The decryption process at the payee requires the same algorithm to be used at the receiving end to complete a payment transaction.

9. A smart community silver guardian card system according to claim 8, characterized in that: The implementation steps of the encryption technology also include: S4) Data integrity verification: Add message authentication codes or digital signatures to data; perform data integrity verification while encrypting using dynamic encryption factors; S5) Key update frequency: Determine the update frequency of dynamic encryption keys based on the system's security requirements and performance limitations; S6) Secure Storage: The data of random number generators, timestamp records and unique tags in RFID modules and CPU cards should be stored securely; physical security measures and encrypted storage technology should be used to protect critical data.

10. A smart community silver guardian card system according to claim 8, characterized in that: In step S2), the specific calculation process of the fusion algorithm includes: The dynamic encryption factors generated by the CPU card and the RFID module are concatenated to form a new input string; Use the SHA-256 hash function to hash the concatenated string to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as: K=H(F CPU ||F RFID ) Where K represents the dynamic encryption key; F CPU and F RFID They are the dynamic encryption factors of the CPU card and the RFID module respectively; ∥ indicates a connection operation.

Images