A smart community senior citizen protection card and its system

Abstract

This invention relates to a smart community senior citizen protection card and its system, belonging to the field of communication and interaction technology. A smart community senior citizen protection card system includes a built-in call module, an NFC integrated module, a WIFI module, and a positioning module; it also includes external community WIFI points, an RFID card reader, an access control card reader, and a central manager; the call module supports SIP call function through a built-in LTE.CAT.1 communication module; the NFC integrated module includes an RFID module and an access control card; the RFID module is used to send tag information to the RFID card reader; the WIFI module is used to scan or connect to community WIFI points. This invention abandons traditional camera surveillance technology and combines RFID, access control, WIFI, and GPS / BeiDou positioning. This multimodal fusion positioning technology improves the full coverage and accuracy of positioning within the community, facilitating emergency rescue.

Description

Technical Field

[0001] This invention belongs to the field of communication and interaction technology, specifically relating to a smart community senior citizen protection card and its system. Background Technology

[0002] Senior citizen protection devices are a range of smart products and services designed specifically for older adults, aiming to improve their quality of life, provide security, and facilitate their daily lives. Some common senior citizen protection devices include:

[0003] The community safety protection kit includes devices such as video surveillance, door magnetic sensors, active call systems, and SOS one-button alarms to monitor the safety of elderly residents. Once an anomaly is detected or an elderly person proactively seeks help, the information will be immediately relayed to the backend and community management personnel will be notified.

[0004] Health monitoring: Smart bracelets and other devices can monitor the health status and location information of the elderly in real time and synchronize the data to a mobile APP, making it convenient for community managers to view at any time.

[0005] Therefore, it can be seen that traditional elderly care devices mainly rely on video surveillance technology and GPS / BeiDou positioning in smart wearables. While these methods can provide real-time video monitoring and location tracking, they have the following shortcomings:

[0006] First, the use of cameras to cover the entire community and monitor the lives of the elderly can easily raise privacy concerns, and many elderly people find this 24 / 7 monitoring method unacceptable. Furthermore, the monitoring range of cameras is limited, large-scale deployment is costly, and data extraction and analysis still require significant manpower and computing power, resulting in a substantial reduction in monitoring effectiveness.

[0007] Second, GPS / BeiDou positioning has limited response speed and accuracy in emergency situations, making it impossible to quickly and accurately locate the specific building and floor of an elderly person, thus affecting the efficiency of emergency rescue. Summary of the Invention

[0008] To address the technical challenges of traditional video surveillance, such as privacy issues, high costs, and the inability of GPS / BeiDou positioning accuracy to cover specific buildings and floors throughout the community, thus affecting emergency rescue efficiency, this invention provides a smart community senior citizen protection card and its system. It combines multimodal fusion positioning technologies such as RFID, access control, WiFi, and GPS / BeiDou positioning to achieve more comprehensive and efficient protection.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] A smart community senior citizen protection card mainly consists of the following components: CPU chip, memory, LTE.CAT.1 communication module, antenna module, audio codec, display screen, buttons, battery, and power management module, used to realize basic call functions;

[0011] It also includes an NFC module for enabling all-in-one card functionality; and a casing to protect the internal components and give it the appearance of a bank card.

[0012] A smart community senior citizen protection card system includes a built-in call module, NFC integrated module, WIFI module, and positioning module; it also includes external community WiFi points, RFID card readers, access control card readers, and a central manager.

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

[0014] The NFC integrated module includes an RFID module and an access control card;

[0015] The RFID module is used to send tag information to the RFID reader to realize the identification and location of cardholder tags in the community's public areas;

[0016] The access card is used to send tag information to the access 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 hotspots to achieve accurate community building location or stable data transmission; the community WiFi hotspots are deployed in various locations within the buildings;

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

[0019] The RFID readers are deployed in different locations within the community. Each reader can read information from nearby RFID tags and record location information.

[0020] The access control card readers are deployed at various entrances and exits of the community to realize the identification and recording management of access control cards when entering and exiting.

[0021] The central manager is used to receive tag information and location information transmitted from various RFID readers, access control readers and community WiFi points, and to perform data analysis and processing.

[0022] The guardian 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 reader uses ultra-high frequency (UHF) RFID radio frequency signals with a signal reception range of less than 6 meters; the access control reader uses low frequency radio frequency signals with a signal reception range of less than 1 meter.

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

[0025] Multiple RFID readers are deployed within the community, and each reader can read tag information from nearby RFID modules.

[0026] When the RFID module enters the reading range of the RFID reader, the reader records the tag information and location information of the RFID module and uploads 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 building positioning function include:

[0029] We scanned the community WiFi hotspots one by one in each building and on each floor, and recorded the hotspot names and building locations of all the community WiFi hotspots.

[0030] Establish a database containing hotspot names and building locations;

[0031] The guardian card uses a built-in WiFi module to scan for nearby WiFi hotspots and record their names;

[0032] By matching the WiFi hotspot names scanned by the security card with the database, the cardholder's building location, i.e., the building and floor, can be deduced.

[0033] Preferably, the implementation steps of the intra-cell movement trajectory estimation function include:

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

[0035] When the NFC integrated module of the guardian card is near an 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 the locations and times the cardholder has passed through in the most recent time period and to calculate the movement trajectory.

[0037] Preferably, the NFC integrated module further 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 uses encryption technology to realize encrypted payment transactions;

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

[0040] S1) Dynamic encryption factor generation:

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

[0042] By introducing microsecond-level timestamps as a dynamic factor, we ensure that each generated encryption factor is timely and prevent replay attacks.

[0043] Both the RFID module and the CPU card 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 a transaction or access is made, the card reader first reads the tag data from the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the backend system to ensure the confidentiality and integrity of data transmission.

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

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

[0048] S3) Encryption and decryption:

[0049] The payment data is processed using an encryption algorithm with the generated dynamic encryption key and securely transmitted to the payee. The payee then needs to use the same algorithm to decrypt the data at the receiving end, thus completing a payment transaction.

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

[0051] S4) Data integrity verification:

[0052] Add a Message Authentication Code (MAC) or digital signature to the data; perform data integrity verification while encrypting using dynamic encryption factors; ensure that the data has not been tampered with during transmission and storage;

[0053] S5) Key update frequency:

[0054] The update frequency of the dynamic encryption key is determined based on the system's security requirements and performance limitations.

[0055] S6) Secure Storage:

[0056] The random number generator, timestamp records, and unique tag data in RFID modules and CPU cards should be stored securely; physical security measures (such as tamper-proof encapsulation) and encrypted storage technologies should be used to protect critical data and prevent it from being read or tampered with.

[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 RFID module are concatenated to form a new input string;

[0059] The concatenated strings are hashed using the SHA-256 hash function to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as:

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

[0061] In the formula, K represents the dynamic encryption key.

[0062] F CPU and F RFID These are the dynamic encryption factors for the CPU card and the RFID module, respectively; || indicates a connection operation.

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

[0064] The beneficial effects of this invention are:

[0065] 1. This 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 utilizes NFC module integration technology to encompass e-wallets, community canteen meal cards, and community life payment cards, providing comprehensive services for seniors and improving their convenience.

[0067] 3. The use of encryption technology ensures the security of payment transactions through the NFC module, enhancing the safety of the elderly's assets and personal information. Attached Figure Description

[0068] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0069] Figure 1 This is a display diagram of a smart community senior citizen protection card according to the present invention.

[0070] Figure 2 This is a modular structural block diagram of a smart community senior citizen protection card system according to the present invention.

[0071] Figure 3 This is a flowchart illustrating the encryption technology in a smart community senior citizen protection card system according to the present invention. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Please see Figure 1 As shown, a smart community senior citizen protection card mainly consists of the following components: CPU chip, memory, LTE.CAT.1 communication module, antenna module, audio codec, display screen, buttons, battery, and power management module, used to realize basic call functions;

[0074] It also includes an NFC module for enabling all-in-one card functionality; and a casing to protect the internal components and give it the appearance of a bank card.

[0075] Specifically, the guardian card of this invention integrates SIP calling, community card functions, and other features into a low-power device based on an LTE.CAT.1 module, and is equipped with a power supply and casing, giving it mobile phone calling capabilities, long battery life, and a bank card-like appearance. This can significantly improve the convenience and quality of life for the elderly.

[0076] Please see Figure 2 and Figure 3As shown, a smart community senior citizen protection card system includes a built-in call module, NFC integrated module, WIFI module, and positioning module; it also includes external community WiFi points, RFID card readers, access control card readers, and a central manager.

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

[0078] The NFC integrated module includes an RFID module and an access control card;

[0079] The RFID module is used to send tag information to the RFID reader to realize the identification and location of cardholder tags in the community's public areas;

[0080] The access card is used to send tag information to the access 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 hotspots to achieve accurate community building location or stable data transmission; the community WiFi hotspots are deployed in various locations within the buildings;

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

[0083] The RFID readers are deployed in different locations within the community. Each reader can read information from nearby RFID tags and record location information.

[0084] The access control card readers are deployed at various entrances and exits of the community to realize the identification and recording management of access control cards when entering and exiting.

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

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

[0087] Specifically, the system integrates three positioning methods—RFID, access cards, and WiFi—to address different environments and accuracy requirements. RFID is used for large-scale positioning within the community; access cards and WiFi are used for precise positioning within buildings; the three complement each other and their combination covers all locations within the community. A GPS / BeiDou positioning module is used for positioning outside the community, providing more comprehensive location information. The integration of multiple positioning technologies improves positioning reliability and reduces the risk of single-technology failure. In emergencies, the system can quickly locate elderly individuals, providing crucial information for rescue efforts, thereby improving rescue efficiency and saving lives.

[0088] The combination of three positioning technologies plays a crucial role in the smart community senior citizen protection card system, effectively improving the safety and convenience of seniors' lives and providing data support for community management and service optimization. The movement trajectory estimation function not only allows for real-time location tracking of seniors but also helps 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 within the community in real time, ensuring safe and efficient management.

[0089] Furthermore, the RFID reader uses ultra-high frequency (UHF) RFID radio frequency signals with a signal reception range of less than 6 meters; the access control reader uses low frequency radio frequency signals with a signal reception range of less than 1 meter.

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

[0091] Multiple RFID readers are deployed within the community, and each reader can read tag information from nearby RFID modules.

[0092] When the RFID module enters the reading range of the RFID reader, the reader records the tag information and location information of the RFID module and uploads 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 building-based positioning function include:

[0095] We scanned the community WiFi hotspots one by one in each building and on each floor, and recorded the hotspot names and building locations of all the community WiFi hotspots.

[0096] Establish a database containing hotspot names and building locations;

[0097] The guardian card uses a built-in WiFi module to scan for nearby WiFi hotspots and record their names;

[0098] The central manager calculates the cardholder's building location, i.e., the building and floor, by matching the WiFi hotspot names scanned by the guardian card with the database.

[0099] Furthermore, the implementation steps of the cell-wide movement trajectory estimation function include:

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

[0101] When the NFC integrated module of the guardian card is near an 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 the locations and times the cardholder has passed through in the most recent time period and to calculate the movement trajectory.

[0103] Specifically, this invention does not monitor the elderly's activities and movements using surveillance cameras, thus effectively protecting their privacy. Instead, it locates the cardholder's position solely through an RFID tag integrated with an NFC module, and infers the elderly's activity range and status, providing protection without the elderly's objection. For the elderly and others, this protective card offers the following benefits:

[0104] In daily operation: data transmission and storage are subject to multiple encryption processes, and only children with the elderly's permission have the right to access data and receive alarm information pushes.

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

[0106] Furthermore, the NFC integrated module also includes an e-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 uses encryption technology to realize encrypted payment transactions;

[0108] Specifically, the guardian card system integrates multiple functions, including calling, NFC payment (e-wallet, community canteen meal card, community life payment card), access control, and location tracking, providing convenient community life services for the elderly. It can significantly improve the convenience of life for seniors and enhance their quality of life.

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

[0110] S1) Dynamic encryption factor generation:

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

[0112] By introducing microsecond-level timestamps as a dynamic factor, we ensure that each generated encryption factor is timely and prevent replay attacks.

[0113] In practical implementation, hardware timestamps can be used in conjunction with secure counters to ensure their uniqueness and unpredictability.

[0114] Both the RFID module and the CPU card 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 identifier) ​​of the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the backend system to ensure the confidentiality and integrity of data transmission.

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

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

[0119] S3) Encryption and decryption:

[0120] The payment data is processed using an encryption algorithm with the generated dynamic encryption key and securely transmitted to the payee. The payee then needs to use the same algorithm to decrypt the data at the receiving end, thus completing 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; perform data integrity verification while encrypting using dynamic encryption factors; ensure that the data has not been tampered with during transmission and storage;

[0124] S5) Key update frequency:

[0125] The update frequency of the dynamic encryption key is determined based on the system's security requirements and performance limitations.

[0126] S6) Secure Storage:

[0127] The random number generator, timestamp records, and unique tag data in RFID modules and CPU cards should be stored securely; physical security measures (such as tamper-proof encapsulation) and encrypted storage technologies should be used to protect critical data and prevent it from being read or tampered with.

[0128] Specifically, the timestamp and dynamic key mechanism employed in this invention effectively prevents replay attacks. The secure key generation and storage mechanism, along with the use of a fusion algorithm, enhances key security and increases the difficulty of cracking. The data integrity verification mechanism effectively prevents data tampering during transmission and storage. This encryption technology ensures system security, improves the property and personal information security of the elderly, and can be securely applied to various payment transaction terminals.

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

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

[0131] The concatenated strings are hashed using the SHA-256 hash function to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as:

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

[0133] In the formula, K represents the dynamic encryption key.

[0134] F CPU and F RFID These are the dynamic encryption factors for the CPU card and the RFID module, respectively; || indicates a connection operation.

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

[0136] In summary, the present invention provides a smart community senior citizen protection card and its system, which is a comprehensive platform for elderly care and security based on multimodal data fusion, dynamic encryption and centralized management; it enables accurate location, identity verification, secure payment and convenient life services for the elderly.

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

[0138] In the several embodiments provided in this application, it should be understood that the disclosed systems, processes, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between modules may be electrical, mechanical, or other forms.

[0139] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0140] If the integrated module is implemented as a software functional 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0141] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0142] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A smart community senior citizen protection card system, characterized in that: It includes the 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 and access control card readers and central manager; The call module supports SIP calling functionality through a built-in LTE.CAT.1 communication module; The NFC integrated module includes an RFID module and an access control card; The RFID module is used to send tag information to the RFID reader to realize the identification and location of cardholder tags in the community's public areas; The access card is used to send tag information to the access card reader to verify the tag when the cardholder enters or exits. The WIFI module is used to scan or connect to community WiFi hotspots to achieve accurate community building location or stable data transmission; the community WiFi hotspots are deployed in various locations within the buildings; The positioning module is used for positioning outside the community, and obtains the geographical location of the cardholder based on the GPS / BeiDou positioning system. The RFID readers are deployed in different locations within the community. Each reader can read information from nearby RFID tags and record location information. The access control card readers are deployed at various entrances and exits of the community to realize the identification and recording management of access control cards when entering and exiting. The central manager is used to receive tag information and location information transmitted from various RFID readers, access control readers and community WiFi points, and to perform data analysis and processing. The guardian card system has the functions of positioning within the community, positioning within the building, and calculating the movement trajectory within the community. The NFC integrated module also includes a community canteen meal card and a community life payment card, and uses encryption technology to realize encrypted payment transactions; The steps for implementing the encryption technology include: S1) Dynamic encryption factor generation: Each time a transaction or access request is initiated, a random number is generated using the tag on the RFID module and the tag on the CPU card; the CPU card includes a community canteen meal card and a community life payment card. By introducing microsecond-level timestamps as a dynamic factor, we can ensure that each generated encryption factor is timely. Both the RFID module and the CPU card 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 from the CPU card and RFID module; at the same time, the card reader establishes a secure connection with the backend 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 authentication information; In the backend system, a fusion algorithm is designed to fuse the dynamic encryption factors from the CPU card and RFID module to generate the final dynamic encryption key. S3) Encryption and decryption: The payment data is processed using an encryption algorithm with the generated dynamic encryption key and securely transmitted to the payee. The payee then needs to use the same algorithm to decrypt the data at the receiving end, thus completing a payment transaction.

2. The smart community senior citizen protection card system according to claim 1, characterized in that: The RFID reader uses ultra-high frequency RFID radio frequency signals; the access control reader uses low frequency radio frequency signals.

3. The smart community senior citizen protection card system according to claim 1, characterized in that: The steps for implementing the intra-cell positioning function include: Multiple RFID readers are deployed within the community, and each reader can read tag information from nearby RFID modules; When the RFID module enters the reading range of the RFID reader, the reader records the tag information and location information of the RFID module and uploads 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. The smart community senior citizen protection card system according to claim 1, characterized in that: The steps for implementing the building-in-building positioning function include: We scanned the community WiFi hotspots one by one in each building and on each floor, and recorded the hotspot names and building locations of all community WiFi hotspots. Establish a database containing hotspot names and building locations; The guardian card uses a built-in WiFi module to scan for nearby WiFi hotspots and record their names; By matching the WiFi hotspot names scanned by the security card with the database, the cardholder's building location, i.e., the building and floor, can be deduced.

5. The smart community senior citizen protection card system according to claim 1, characterized in that: The steps for implementing the intra-cell movement trajectory estimation function include: Install RFID card readers at key locations within the community, as well as access control card readers at entrances, corridors, and stairwells; ensure that all devices can reliably connect to the central manager and upload data in real time or periodically; When the NFC integrated module of the guardian card is near an 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 the locations and times the cardholder has passed through in the most recent time period and to calculate the movement trajectory.

6. The smart community senior citizen protection card system according to claim 1, characterized in that: The NFC integrated module also includes an e-wallet module, which is used to bind WeChat Pay or Alipay to realize payment transactions.

7. The smart community senior citizen protection card system according to claim 1, characterized in that: The implementation steps of the encryption technology also include: S4) Data integrity verification: Add message authentication codes or digital signatures to the data; perform data integrity verification while encrypting using dynamic encryption factors; S5) Key update frequency: The update frequency of the dynamic encryption key is determined based on the system's security requirements and performance limitations. S6) Secure Storage: The random number generator, timestamp records, and unique tag data in RFID modules and CPU cards should be stored securely; physical security measures and encrypted storage technologies should be used to protect critical data.

8. The smart community senior citizen protection card system according to claim 1, 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 RFID module are concatenated to form a new input string; The concatenated strings are hashed using the SHA-256 hash function to generate the final dynamic encryption key; the SHA-256 hash function formula is expressed as: In the formula, Indicates a dynamic encryption key; and These are the dynamic encryption factors for the CPU card and the RFID module, respectively. This indicates a join operation.

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