Passive ink screen signboard tamper-proofing method

Abstract

The invention discloses a tamper-proofing method for a passive ink screen signboard, and relates to the technical field of NFC equipment authentication, and the method comprises the steps: S1, obtaining NFC information, and generating a first check code based on the NFC information; s2, integrating the first check code with the target display data to generate an NFC integrated data packet and a second check code, and storing the NFC integrated data packet and the second check code into a target ink screen signboard; s3, extracting the second check code and the time identifier, comparing the second check code and the time identifier with a built-in password of the target ink screen signboard, and generating a comparison identifier and a third check code based on a comparison result; s4, comparing the third check code with the second check code to obtain an auditing state instruction, and executing a data display action of the data signboard according to the auditing state instruction; the problem that a conventional ink screen signboard lacks an information authentication mechanism, and consequently the signboard is low in safety is solved, the safety and reliability of signboard data transmission are remarkably improved, and then the safety of data is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of NFC device authentication, and in particular to a passive ink screen identification card anti-tampering method. Background Art

[0002] With the widespread use of information signs, ink screens (also known as electronic paper) have gradually replaced traditional paper signs due to their advantages such as low power consumption, high readability and visual comfort. However, the information security issues of ink screen signs are becoming increasingly prominent. Traditional ink screen sign information updates rely on dedicated writing devices, but the communication and data transmission process between existing writing devices and signboards often lacks an effective authentication mechanism, which makes the information easily tampered by unauthorized third parties. Once the information on the sign is maliciously modified, it will not only cause information misleading, but may also cause serious public safety crises, commercial fraud and other problems. In order to solve this problem, some ink screen sign systems that use encryption technology to protect information transmission have appeared on the market. However, these systems usually rely on active components (such as batteries) for power supply, which not only increases the complexity and cost of the system, but also limits the deployment and use environment of the sign.

[0003] Chinese patent, publication number: CN210348532U, publication time: April 17, 2024, discloses a passive NFC anti-counterfeiting chip that realizes anti-tampering detection by detecting the on and off of the pin, including an NFC signal processing unit and two external pins connected thereto, the two external pins are respectively connected to the input and output ends of the antenna, the NFC signal processing unit is the NFC tag chip, including a CPU and an NFC baseband, a memory and a power module connected thereto; the anti-counterfeiting chip also includes an anti-tampering control unit, the anti-tampering control unit includes an anti-tampering control circuit and two anti-tampering detection pins connected thereto, and the two anti-tampering detection pins are externally connected to a tampering detection sensor; however, this scheme verifies the acquired information to confirm the authenticity of the product and trace the information of the production, logistics and sales of the product, that is, the information verification is performed after receiving the information, which only ensures the accuracy of the acquired data, rather than establishing an authentication mechanism between the NFC reading device and the NFC product to prevent the interactive data from being tampered with, and the applicable field is limited. Summary of the invention

[0004] The purpose of the present invention is to address the problem that conventional ink screen identification tags lack an information authentication mechanism, resulting in low security of the identification tags; a passive ink screen identification tag anti-tampering method is proposed, which generates a first verification code by reading the NFC information of the identification tag, integrates the first verification code with the target display data to generate a second verification code and writes it into the identification tag; compares the second verification code with the built-in password of the identification tag, generates a comparison mark according to the comparison result, and further generates a third verification code according to the comparison mark; compares the third verification code with the second verification code to obtain an audit status instruction, and executes the identification tag data display action based on the audit status instruction; authenticates and verifies the NFC identity and display data of the identification tag through two verification actions, significantly improves the security and reliability of the identification tag data transmission, can effectively prevent information from being maliciously tampered with, and thus ensures the security of the data.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a passive ink screen identification card anti-tampering method, comprising the following steps: S1. Obtain NFC information, and generate a first verification code based on the NFC information; S2, integrating the first verification code with the target display data to generate an NFC integrated data packet and a second verification code, and storing the NFC integrated data packet and the second verification code in the target ink screen identification card; S3, extracting the second verification code and the time mark and comparing them with the built-in password of the target ink screen identification plate, and generating a comparison mark and a third verification code based on the comparison result; S4. Compare the third verification code with the second verification code, obtain the audit status instruction, and execute the data display action of the data identification plate according to the audit status instruction.

[0006] In this solution, by obtaining the NFC information of the identification tag, each ink screen identification tag can be accurately identified, and a first verification code is generated to perform preliminary identity authentication on the ink screen identification tag, thereby increasing the security of information transmission; by integrating the first verification code and the target display data, an encrypted data packet is formed, so that the data stored on the identification tag includes the integrity of the data and the verification information of the source, so as to facilitate subsequent verification and ensure the correct display of the data; the introduction of the time mark ensures the timeliness of the data and can prevent the use of outdated or invalid data for updating. The comparison mark generated according to the comparison result provides clear instructions for subsequent data processing. At the same time, by comparing the third verification code and the second verification code, it is determined whether the ink screen identification tag has passed all security verifications; only when all verifications are passed will the data be displayed on the ink screen, thereby ensuring that the user sees real, complete, and untampered information.

[0007] Preferably, the S1 comprises the following sub-steps: The NFC reader / writer starts the reading mode based on the NFC antenna of the target e-ink screen identification tag and reads the NFC unique identifier of the target e-ink screen identification tag; The NFC unique identifier is encrypted to generate a multi-byte verification code and the multi-byte verification code is used as the first verification code.

[0008] Preferably, encrypting the NFC unique identifier comprises: The NFC unique identifier is shifted, a constant is added, and the high and low bits of the bytes are inverted to obtain a multi-byte verification code.

[0009] Preferably, the step of integrating the first verification code with the target display information to generate an NFC integrated data packet and a second verification code comprises the following sub-steps: The first verification code and the current time mark of the NFC reading and writing device are integrated with the target display data to be displayed to obtain an NFC integrated data packet; The NFC reading and writing device calculates the NFC integrated data packet based on a data verification algorithm to obtain the second verification code.

[0010] Preferably, storing the NFC integrated data packet and the second verification code into the target ink screen identification tag comprises the following sub-steps: The NFC reading and writing device starts the writing mode based on the NFC antenna of the target ink screen identification tag, and writes the NFC integrated data packet and the second verification code into the register of the target ink screen identification tag for information storage.

[0011] Preferably, S3 includes the following sub-steps: In response to the NFC integrated data packet, extracting target data through a microcontroller of a target ink screen identification tag, wherein the target data includes the time identifier and the first verification code; Compare the time identifier with the historical time in the register of the target ink screen identification plate, and compare the first verification code with the built-in password, and generate a comparison identifier based on the comparison result of the time identifier and the comparison result of the first verification code; Based on the generated comparison identifier, a data verification algorithm is used to calculate the NFC integrated data packet to obtain a third verification code.

[0012] Preferably, the generating of the comparison mark based on the comparison result of the time mark and the comparison result of the first verification code comprises: comparing the first verification code with the built-in password, and when the first verification code is the same as the built-in password, the verification passes and a first verification result is generated; Synchronously, the time identifier is compared with the time identifier last stored in the corresponding register. If the time identifier is greater than the time identifier last stored, the verification is passed and a second verification result is generated; A comparison mark is generated according to the first verification result and the second verification result.

[0013] Preferably, the S3 further includes: The microcontroller of the target ink screen identification tag sends the comparison identification and the third verification code to the NFC reading and writing device based on the NFC antenna.

[0014] Preferably, the step of comparing the third verification code with the second verification code to obtain the review status instruction comprises the following sub-steps: The NFC reader / writer responds to the comparison mark and compares the third verification code with the second verification code. If the third verification code is the same as the second verification code, an audit success instruction is generated; if the third verification code is different from the second verification code, an audit failure instruction is generated.

[0015] Preferably, the step of performing the data identification plate data update action according to the audit status instruction includes: In response to the audit status instruction, the target display data is written into the ink screen module for data display, and the corresponding audit status instruction is synchronously displayed on the ink screen, and the writing time of the target display data is marked on the ink screen based on the time identifier; wherein, if an audit success instruction is received, a comparison pass is displayed on the ink screen; if an audit failure instruction is received, a comparison error is displayed on the ink screen.

[0016] Beneficial effects of the present invention: 1. By integrating the target display data with the first check code and generating a second check code, and then storing these data in the identification plate, the data stored on the identification plate contains the data integrity and source verification information. Even if the data is intercepted or tampered with during the data transmission process, the tampered data cannot be correctly identified and displayed due to the existence of the check code, thereby ensuring the authenticity of the data; 2. The dual verification mechanism of the second verification code and the time stamp can prevent data from being reused or expired, increase the security level of data, prevent data from being copied or reused, and ensure the timeliness of data; among them, the use of built-in passwords for comparison further increases data security and prevents unverified access or modification; 3. By comparing the third verification code with the second verification code, it is determined whether the data has passed all security verifications, thereby ensuring that the information the user sees is true, complete, and has not been tampered with. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings. The drawings are only for the purpose of illustrating preferred embodiments and are not to be considered as limiting the present invention. Also, the same reference symbols are used throughout the drawings to represent the same parts.

[0018] Figure 1 This is a flow chart of a passive ink screen identification card anti-tampering method according to an embodiment of the present application.

[0019] Figure 2 This is a flowchart of the authentication of an ink screen identification card and an NFC reading and writing device according to an embodiment of the present application.

[0020] Figure 3 This is a structural diagram of the internal data processing framework of an ink screen sign according to an embodiment of the present application.

[0021] Figure 4 This is a schematic diagram of data display of an ink screen identification plate according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example 1: Figure 1 As shown, a passive ink screen identification card anti-tampering method includes steps S1-S4, wherein: S1, obtaining NFC information, and generating a first verification code based on the NFC information, wherein: The NFC reader / writer starts the reading mode based on the NFC antenna of the target e-ink screen identification tag and reads the NFC unique identifier of the target e-ink screen identification tag; The NFC unique identifier is encrypted to generate a multi-byte verification code and the multi-byte verification code is used as the first verification code.

[0024] Specifically, encrypting the NFC unique identifier includes: The NFC unique identifier is shifted, a constant is added, and the high and low bits of the bytes are inverted to obtain a multi-byte verification code.

[0025] In this embodiment, the NFC reading and writing device is a device capable of NFC reading and writing data, such as a mobile phone or an NFC card reader. Ensuring that the communication between the reading and writing device and the identification card is based on a known and unique NFC identifier is the basis for all subsequent security operations. By obtaining the unique identifier ID of the ink screen identification card for preliminary identification card identity authentication, unauthorized reading and writing devices are prevented from attempting to establish a connection with the identification card, increasing confidence in security and reliability, providing a reliable starting point for subsequent data processing, and ensuring the consistency and accuracy of the entire information anti-tampering process.

[0026] S2. Integrate the first verification code with the target display data to generate an NFC integrated data packet and a second verification code, and store the NFC integrated data packet and the second verification code in the target ink screen identification card, wherein: The step of integrating the first verification code with the target display information to generate an NFC integrated data packet and a second verification code includes the following sub-steps: The first verification code and the current time mark of the NFC reading and writing device are integrated with the target display data to be displayed to obtain an NFC integrated data packet; The NFC reading and writing device calculates the NFC integrated data packet based on a data verification algorithm to obtain the second verification code.

[0027] Specifically, the step of storing the NFC integrated data packet and the second verification code into the target ink screen identification card includes the following sub-steps: The NFC reading and writing device starts the writing mode based on the NFC antenna of the target ink screen identification tag, and writes the NFC integrated data packet and the second verification code into the register of the target ink screen identification tag for information storage.

[0028] In this embodiment, the data to be displayed (target display data) is integrated with the first check code, and a new check code (second check code) is generated, and then these data are stored in the identification card. In this way, the data stored on the identification card contains the integrity of the data and the verification information of the source. Even if the data is intercepted or tampered with during the data transmission process, due to the existence of the check code, the tampered data cannot be correctly identified and displayed, thereby ensuring the authenticity of the data, improving the anti-tampering ability of the data, and ensuring that the information seen by the user is true and reliable.

[0029] S3, extract the second verification code and time mark and compare them with the built-in password of the target ink screen identification plate, and generate a comparison mark and a third verification code based on the comparison result, wherein: In response to the NFC integrated data packet, extracting target data through a microcontroller of a target ink screen identification tag, wherein the target data includes the time identifier and the first verification code; Compare the time identifier with the historical time in the register of the target ink screen identification plate, and compare the first verification code with the built-in password, and generate a comparison identifier based on the comparison result of the time identifier and the comparison result of the first verification code; Based on the generated comparison identifier, a data verification algorithm is used to calculate the NFC integrated data packet to obtain a third verification code.

[0030] Specifically, the generating of the comparison mark based on the comparison result of the time mark and the comparison result of the first verification code includes: comparing the first verification code with the built-in password, and when the first verification code is the same as the built-in password, the verification passes and a first verification result is generated; Synchronously, the time identifier is compared with the time identifier last stored in the corresponding register. If the time identifier is greater than the time identifier last stored, the verification is passed and a second verification result is generated; A comparison mark is generated according to the first verification result and the second verification result.

[0031] Specifically, the S3 further includes: The microcontroller of the target ink screen identification tag sends the comparison identification and the third verification code to the NFC reading and writing device based on the NFC antenna.

[0032] In this embodiment, by comparing the second verification code with the built-in password, unauthorized access or modification can be prevented to ensure that the source of the data packet is reliable; the comparison of the time mark can prevent the data packet from being reused or expired, further increasing the security and validity of the data; among them, the use of the data verification algorithm can detect whether errors have occurred in the data packet during transmission, including single-bit errors, double-bit errors, insertion errors, etc., to help ensure that the received data is complete and has not been tampered with. At the same time, when the data packet passes all verifications and checks, the ink screen will display the correct information, providing users with clear and accurate information feedback and improving the user experience.

[0033] S4. Compare the third verification code with the second verification code to obtain the audit status instruction, and execute the data display action of the data identification plate according to the audit status instruction, wherein: The comparing the third verification code with the second verification code to obtain the audit status instruction includes the following sub-steps: the NFC reader / writer responds to the comparison mark and compares the third verification code with the second verification code. If the third verification code is the same as the second verification code, an audit success instruction is generated; if the third verification code is different from the second verification code, an audit failure instruction is generated.

[0034] Specifically, the data identification plate data update action is executed according to the audit status instruction, including: In response to the audit status instruction, the target display data is written into the ink screen module for data display, and the corresponding audit status instruction is synchronously displayed on the ink screen, and the writing time of the target display data is marked on the ink screen based on the time identifier; wherein, if an audit success instruction is received, a comparison pass is displayed on the ink screen; if an audit failure instruction is received, a comparison error is displayed on the ink screen.

[0035] In this embodiment, by comparing the third verification code and the second verification code, it is determined whether the data has passed all security verifications; the data will be displayed on the ink screen only when all verifications are passed, thereby ensuring that the user sees true, complete, and untampered information; if the verification fails, an error message is displayed to remind the user that there may be problems with the data.

[0036] As a specific implementation method, Figure 2 and Figure 3 As shown, the steps of the ink screen identification card anti-tampering method are as follows: Step 1: When the target ink screen identification card is placed on the NFC reader / writer, the NFC reader / writer senses the NFC antenna and turns on the reading mode. The NFC antenna of the ink screen identification card obtains energy and starts working, so that the NFC reader / writer reads the NFC information of the ink screen identification card, including the 64-bit unique identifier ID. After shifting, adding constants, and inverting the high and low bits of the obtained 64-bit unique identifier ID, an 8-byte verification code (first verification code) is generated.

[0037] Step 2: Insert the first check code (8 bytes) and the current time mark (8 bytes) before the content data packet (i.e. the data that needs to be displayed on the ink screen sign (target display data)), and package it into a complete data packet (NFC integrated data packet); at the same time, perform a cyclic redundancy data check on the data packet, generate a second check code and store it in the register for standby use. In this embodiment, the content data packet uses a 314*485 dot matrix screen, the data packet size is 15k bytes, and the resolution is selected: the sign design standard is 250mm, and a white circle with a diameter of 200mm is printed on the front. The words "Work Here" are printed in black in the middle, and the ink screen is designed below it. The space is about 66*102mm, designed at 0.21mm per pixel, and the dot matrix is ​​314*485.

[0038] It can be understood that the cyclic redundancy data check algorithm generates a fixed-length check code (or redundant code) by performing specific mathematical operations on the data, and attaches the check code to the end of the data packet. After receiving the data packet, the receiver will perform the same operation on the data in the data packet to generate a check code for the receiver. By comparing the check code of the sender and the check code of the receiver, it can be determined whether an error has occurred in the data transmission process. In this embodiment, by using the cyclic redundancy data check method, a high proportion of errors in the information transmission process can be corrected, the accuracy of the data can be ensured, and the calculation of the data check code can be completed in a very short time, and the error correction process can be completed quickly; in addition, it helps to improve the efficiency of data transmission. When an error occurs in the data, the receiver can immediately ask the sender to resend the data instead of waiting for the entire data packet to be transmitted before error handling.

[0039] Step 3: The NFC reader / writer turns on the write mode and writes the data packet with the second verification code and time stamp into the register of the ink screen identification tag.

[0040] Step 4: The microcontroller chip of the ink screen identification card intercepts the first 16 bytes of the data packet, including the second check code and the time mark. The second check code is compared with the built-in password, and it is judged to be passed if they are the same. The time mark is compared with the previous time mark in the corresponding memory. If the time is greater than the previous time mark, it is judged to be passed and overwritten. The above two comparisons generate a comparison mark, which contains the above two information; perform a cyclic redundancy data check on the received data packet and generate a third check code.

[0041] In this embodiment, the dual verification mechanism of the second check code and the time stamp, as well as the addition of cyclic redundancy data check, together constitute a powerful anti-tampering system. Even if the data packet is maliciously tampered with during transmission, due to the existence of these verification mechanisms, the tampered data packet cannot pass the verification, thereby ensuring the authenticity of the data.

[0042] Step 5: The ink screen ID tag transmits the comparison ID and the third verification code back to the NFC reader / writer through the NFC antenna.

[0043] Step 6: The NFC reader / writer compares the third verification code with the second verification code in the register; if they are the same, a review success instruction is sent, otherwise a review failure instruction is sent; and the verification status (for example: data transmission success / no) and comparison status (for example: device verification success / no; whether there are any modification traces / no) are displayed on the operation interface according to the verification result.

[0044] Step 7: After the ink screen identification card receives the review instruction, it writes the generated display data into the ink screen module, and the displayed content is marked with a prompt mark indicating whether it has passed; if the comparison is passed, the lower right content of the content data packet is modified to "Comparison passed"; if the comparison is not passed, the lower right content of the content data packet is modified to "Comparison error" (such as Figure 4 shown).

[0045] Beneficial effects of the embodiment: By reading the NFC unique identifier ID to generate the first verification code, the preliminary authentication between the reading and writing device and the identification card is ensured, and the unauthenticated reading and writing device is effectively prevented from trying to communicate with the identification card, thereby increasing data security. The data to be displayed (target display data) is integrated with the first verification code, and a new verification code (second verification code) is generated, and then these data are stored in the identification card, so that the data stored on the identification card contains the data integrity and source verification information, ensuring the integrity of the data and the traceability of the source; even if the data is intercepted or tampered with during the data transmission process, due to the existence of the verification code, the tampered data cannot be correctly identified and displayed, thereby ensuring the authenticity of the data. By comparing the second verification code, the time mark and the built-in password, the integrity and timeliness of the data are ensured. The time mark can prevent the data from being reused or expired. The security level of the data is increased, preventing the data from being copied or reused, while ensuring the timeliness of the data. By comparing the third verification code and the second verification code, it is determined whether the data has passed all security verifications. Only when all verifications are passed will the data be displayed on the ink screen, thus ensuring that the user sees authentic, complete, and untampered information. If the verification fails, an error message will be displayed to remind the user that there may be problems with the data.

[0046] The above specific embodiments are preferred embodiments of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the present specific embodiments. All equivalent changes made in accordance with the shape, structure, and method of the present invention are within the protection scope of the present invention.

Claims

1. A passive ink screen identification card anti-tampering method, characterized by: The steps include: S1. Obtain NFC information, and generate a first verification code based on the NFC information; S2, integrating the first verification code with the target display data to generate an NFC integrated data packet and a second verification code, and storing the NFC integrated data packet and the second verification code in the target ink screen identification card; S3, extracting the second verification code and the time mark and comparing them with the built-in password of the target ink screen identification plate, and generating a comparison mark and a third verification code based on the comparison result; S4. Compare the third verification code with the second verification code, obtain the audit status instruction, and execute the data display action of the data identification plate according to the audit status instruction.

2. The method for preventing tampering of a passive ink screen identification plate according to claim 1, characterized in that: The S1 comprises the following sub-steps: The NFC reader / writer starts the reading mode based on the NFC antenna of the target e-ink screen identification tag and reads the NFC unique identifier of the target e-ink screen identification tag; The NFC unique identifier is encrypted to generate a multi-byte verification code and the multi-byte verification code is used as the first verification code.

3. The method for preventing tampering of a passive ink screen identification plate according to claim 2, characterized in that: The encrypting the NFC unique identifier includes: The NFC unique identifier is shifted, a constant is added, and the high and low bits of the bytes are inverted to obtain a multi-byte verification code.

4. The method for preventing tampering of a passive ink screen identification plate according to claim 2, characterized in that: The step of integrating the first verification code with the target display information to generate an NFC integrated data packet and a second verification code includes the following sub-steps: The first verification code and the current time mark of the NFC reading and writing device are integrated with the target display data to be displayed to obtain an NFC integrated data packet; The NFC reading and writing device calculates the NFC integrated data packet based on a data verification algorithm to obtain the second verification code.

5. The method for preventing tampering of a passive ink screen identification plate according to claim 4, characterized in that: The step of storing the NFC integrated data packet and the second verification code into the target ink screen identification card includes the following sub-steps: The NFC reading and writing device starts the writing mode based on the NFC antenna of the target ink screen identification tag, and writes the NFC integrated data packet and the second verification code into the register of the target ink screen identification tag for information storage.

6. The method for preventing tampering of a passive ink screen identification plate according to claim 4, characterized in that: The S3 comprises the following sub-steps: In response to the NFC integrated data packet, extracting target data through a microcontroller of a target ink screen identification tag, wherein the target data includes the time identifier and the first verification code; Compare the time identifier with the historical time in the register of the target ink screen identification plate, and compare the first verification code with the built-in password, and generate a comparison identifier based on the comparison result of the time identifier and the comparison result of the first verification code; Based on the generated comparison identifier, a data verification algorithm is used to calculate the NFC integrated data packet to obtain a third verification code.

7. The method for preventing tampering of a passive ink screen identification plate according to claim 6, characterized in that: The generating of the comparison mark based on the comparison result of the time mark and the comparison result of the first verification code includes: Compare the first verification code with the built-in password. When the first verification code is the same as the built-in password, the verification passes and a first verification result is generated. Synchronously, the time identifier is compared with the time identifier last stored in the corresponding register. If the time identifier is greater than the time identifier last stored, the verification is passed and a second verification result is generated; A comparison mark is generated according to the first verification result and the second verification result.

8. The method for preventing tampering of a passive ink screen identification plate according to claim 6, characterized in that: The S3 also includes: the microcontroller of the target ink screen identification plate sends the comparison mark and the third verification code to the NFC reading and writing device based on the NFC antenna.

9. The method for preventing tampering of a passive ink screen identification plate according to claim 6, characterized in that: The step of comparing the third verification code with the second verification code to obtain the review status instruction includes the following sub-steps: The NFC reader / writer responds to the comparison mark and compares the third verification code with the second verification code. If the third verification code is the same as the second verification code, an audit success instruction is generated; if the third verification code is different from the second verification code, an audit failure instruction is generated.

10. The method for preventing tampering of a passive ink screen identification plate according to claim 9, characterized in that: The data identification plate data update action is executed according to the audit status instruction, including: In response to the audit status instruction, the target display data is written into the ink screen module for data display, and the corresponding audit status instruction is synchronously displayed on the ink screen, and the writing time of the target display data is marked on the ink screen based on the time identifier; wherein, if an audit success instruction is received, a comparison pass is displayed on the ink screen; if an audit failure instruction is received, a comparison error is displayed on the ink screen.

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