A terminal bidirectional verification method based on low-frequency time code time service technology

Abstract

A terminal bidirectional verification method based on low-frequency time code time service technology, relying on low-frequency time code time service technology, through receiving the BPC time service device of the national time service center, obtaining standard time information, and then through the trusted time and space platform and the time and position information processing end, ensuring that the time information received by the terminal device is absolutely correct, in addition, through the reverse verification mechanism, avoiding the tampering of time and position information in the transmission process, meeting the requirements of source credibility, use credibility, information traceability and time propagation authentication.

Description

Technical Field

[0001] This invention relates to the field of time synchronization technology, and in particular to a two-way verification method for terminals based on low-frequency time code synchronization technology. Background Technology

[0002] With social progress and development, various industries have increasingly higher requirements for the accuracy of time and location. Low-frequency time code synchronization technology, due to its ability to provide standard time and frequency signals in both analog and digital modes, has been widely used in many fields. In addition, with the widespread use of networks and information systems in various industries today, the security of information during transmission has attracted the attention of enterprises. Relying on low-frequency time code synchronization technology can ensure the reliability of data sources, accuracy, and usage, as well as the traceability of information and the authentication of time transmission, which is of great significance.

[0003] The following are the relevant literature on two-way verification methods for terminals based on low-frequency time code synchronization technology:

[0004] Patent 1: A Time Synchronization System and Method for a Classified Network; Application No.: 202111179915.X; Application Date: 2021-10-11; Applicant: National Time Service Center, Chinese Academy of Sciences; Abstract: This invention discloses a time synchronization system and method for a classified network, which can synchronize the time of a classified network without posing a threat to network information security. The system includes a GNSS receiver equipped with a GNSS antenna and a BPC module equipped with a BPC antenna. Both the GNSS receiver and the BPC module are communicatively connected to a clock module. The GNSS receiver can receive satellite navigation signals and provide the calculated time information to the clock module. The BPC module can receive BPC low-frequency time code information and provide the calculated time information to the clock module. The clock module is communicatively connected to the classified network. The clock module can receive the time information output from the GNSS receiver and the BPC module, adjust its internal clock in real time, and send it to the classified network. The GNSS receiver, BPC module, and clock module are all communicatively connected to a control module, which can control the operation of the GNSS receiver, BPC module, and clock module.

[0005] Patent 2: A BPC BeiDou Multi-mode Timing Method and System; Application No.: 201810865207.3; Application Date: 2018-08-01; Applicant: Guilin University of Electronic Technology; Abstract: This invention provides a BPC BeiDou multi-mode timing method and system. The method includes: receiving BPC low-frequency timing signals broadcast from the BPC signal transmission tower of the National Time Service Center and BeiDou navigation signals transmitted by BeiDou satellites; determining whether the received BPC low-frequency timing signals and BeiDou navigation signals are normal; if the BeiDou navigation signal is abnormal, then selecting the BPC low-frequency time code timing mode for timing; if the BPC low-frequency timing signal is abnormal, then selecting the BeiDou satellite timing mode for timing; if both are normal, then selecting the BPC and BeiDou dual-mode timing mode for timing; and correcting the BPC low-frequency time code timing through BeiDou positioning. This invention provides multiple timing modes, which can select the corresponding timing mode according to whether the received BPC low-frequency timing signal and BeiDou navigation signal are normal. It uses BeiDou positioning to correct the BPC signal transmission delay to provide high-precision timing, thus improving the flexibility and reliability of timing.

[0006] Patent 3: A satellite anti-spoofing processing method and system based on a time synchronization device; Application No.: 201911422372.2; Application Date: 2019-12-30; Applicant: Zhengzhou Wecom Huada Beidou Navigation Technology Co., Ltd.; Abstract: This invention discloses a satellite anti-spoofing processing system based on a time synchronization device, including a low-frequency time code parsing unit, a time-frequency time code maintenance unit, and a comparison and verification unit; the low-frequency time code demodulation unit: uses a high-frequency clock to synchronously sample and count the pulse width of the low-frequency time code signal to obtain time information and restore the quasi-second flag signal; the time-frequency time code maintenance unit: uses the time information parsed in the low-frequency time code demodulation unit combined with the quasi-second flag signal to restore standard time information containing second values; the comparison and verification unit: compares and verifies the satellite time message according to the low-frequency time code time information to determine whether there is spoofing of the time information. This invention uses low-frequency time code timing signals as a reference to determine the continuity of satellite time information. Regardless of whether the time synchronization device is in the initialization stage or the normal operation stage, it can identify deceptive interference signals targeting satellite signals.

[0007] As can be seen from the above literature, most low-frequency time code synchronization solutions on the market currently perform one-way verification of time information at the terminal. This may lead to inconsistencies between the time information received by the terminal and the time information sent by the service platform. In addition, most existing solutions only have time information verification and lack location information verification, which will inevitably affect the application of some terminals that require accurate time and location information. Summary of the Invention

[0008] The purpose of this invention is to solve the above problems by providing a two-way verification method for terminals based on low-frequency time code synchronization technology.

[0009] The terminal two-way verification method based on low-frequency time code synchronization technology includes the following steps:

[0010] (1) The trusted spatiotemporal platform receives standard time and location signals from the National Time Service Center and the BeiDou Satellite National Standard Time System;

[0011] (2) The trusted spatiotemporal platform processes, marks, and saves the received standard time and location signals;

[0012] (3) After the trusted spatiotemporal platform completes the saving, it sends the tagged time and location signals to the terminal;

[0013] (4) After receiving the tagged time and location signal, the terminal tagged the signal again. The two tags were consistent, and the signal that had been tagged twice was fed back to the trusted spatiotemporal platform for comparison.

[0014] (5) The trusted spatiotemporal platform sequentially compares the time and location signals sent to the terminal with the time and location signals fed back by the terminal to see if they are consistent. If they are consistent, the platform sends a feedback message that the comparison is successful to the terminal. If they are inconsistent, the platform re-marks the time and location information and sends it to the terminal. After receiving the information, the terminal performs feedback comparison again until the comparison is successful.

[0015] (6) The terminal takes action based on the time and location information of the comparison.

[0016] Furthermore, the trusted spatiotemporal platform consists of a host computer, an embedded program, a server, an encoder, and an embedded encoding program. The embedded program is installed in the host computer and can receive and display the received time and space information, and act as a relay station to transmit the information to the lower-level terminal. The server is used to transmit and store the received and sent time and space information for comparison and verification. The embedded encoding program is installed in the encoder and can encode and mark the time and location information.

[0017] Furthermore, the trusted spatiotemporal platform processes the received standard time and location signals by means of an amplifier to select the frequency, amplify, filter and shape the received signals, and then extract, decode and restore them by a demodulation circuit.

[0018] Furthermore, the terminal has a built-in transceiver antenna, encoder, embedded encoding program and host computer. The transceiver antenna is used to transmit and receive signals. The embedded encoding program is installed in the encoder and can encode and mark time and position information. The host computer is used to process time and position signals and send feedback comparison signals to the trusted spatiotemporal platform.

[0019] Further, the encryption algorithm of the embedded encoding program is as follows: 1. Divide the plaintext into multiple blocks of the length of the key string, where the space character is represented by "+"; 2. Replace each character of the plaintext with an integer in the range of 0-26, where space character = 00, A = 01, ..., Z = 26; 3. Replace each character of the key in the same way as in step 2; 4. For each block of plaintext, replace each character with the integer code value obtained by the sum of the corresponding integer code and the integer code of the character at the corresponding position in the key, modulo 27; 5. Replace the integer code in the result of step 4 with its equivalent character.

[0020] Working principle:

[0021] After receiving standard time and location signals from national standard time systems such as the National Time Service Center and BeiDou satellites, the Trusted Spatiotemporal Platform processes, marks, and saves these signals. The marked time and location signals are then sent to the terminal. Upon receiving the signals, the terminal marks them again and feeds back the double-marked time and location signals to the Trusted Spatiotemporal Platform for comparison. If the comparison is successful, the terminal takes action based on the time and location signals. If the comparison fails, the Trusted Spatiotemporal Platform sends new time and location signals to the terminal again until the comparison is successful.

[0022] The significant beneficial effects of this invention are:

[0023] (1) This invention relies on low-frequency time code technology and adds a feedback mechanism so that when there is an error between the time and location signal received by the terminal and the time and location signal sent by the trusted spatiotemporal platform, the error can be corrected autonomously, thus ensuring the normal operation of the device.

[0024] (2) By adding a mark to the time and location signals sent from the trusted spatiotemporal platform to the terminal, the present invention enables the terminal to perform bidirectional verification with the trusted spatiotemporal platform, thus avoiding the occurrence of time and location signals being tampered with.

[0025] (3) By encrypting the time and location signals, the present invention makes the time and location information received by the terminal authoritative, authentic and traceable, and makes some information recorded by the terminal an important basis, which is of great practical significance, especially for police officers and judicial workers. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structural principle of the present invention. Detailed Implementation

[0027] Specific Implementation Example 1

[0028] A terminal two-way verification method based on low-frequency time code synchronization technology includes the following steps:

[0029] (1) The trusted spatiotemporal platform receives standard time and location signals from the National Time Service Center and the BeiDou Satellite National Standard Time System;

[0030] (2) The trusted spatiotemporal platform processes, marks, and saves the received standard time and location signals;

[0031] (3) After the trusted spatiotemporal platform completes the saving, it sends the tagged time and location signals to the terminal;

[0032] (4) After receiving the tagged time and location signal, the terminal tagged the signal again. The two tags were consistent, and the signal that had been tagged twice was fed back to the trusted spatiotemporal platform for comparison.

[0033] (5) The trusted spatiotemporal platform sequentially compares the time and location signals sent to the terminal with the time and location signals fed back by the terminal to see if they are consistent. If they are consistent, the platform sends a feedback message that the comparison is successful to the terminal. If they are inconsistent, the platform re-marks the time and location information and sends it to the terminal. After receiving the information, the terminal performs feedback comparison again until the comparison is successful.

[0034] (6) The terminal takes action based on the time and location information of the comparison.

[0035] Furthermore, the trusted spatiotemporal platform consists of a host computer, an embedded program, a server, an encoder, and an embedded encoding program. The embedded program is installed in the host computer and can receive and display the received time and space information, and act as a relay station to transmit the information to the lower-level terminal. The server is used to transmit and store the received and sent time and space information for comparison and verification. The embedded encoding program is installed in the encoder and can encode and mark the time and location information.

[0036] Furthermore, the trusted spatiotemporal platform processes the received standard time and location signals by means of an amplifier to select the frequency, amplify, filter and shape the received signals, and then extract, decode and restore them by a demodulation circuit.

[0037] Furthermore, the terminal has a built-in transceiver antenna, encoder, embedded encoding program and host computer. The transceiver antenna is used to transmit and receive signals. The embedded encoding program is installed in the encoder and can encode and mark time and position information. The host computer is used to process time and position signals and send feedback comparison signals to the trusted spatiotemporal platform.

[0038] Further, the encryption algorithm of the embedded encoding program is as follows: 1. Divide the plaintext into multiple blocks of the length of the key string, where the space character is represented by "+"; 2. Replace each character of the plaintext with an integer in the range of 0-26, where space character = 00, A = 01, ..., Z = 26; 3. Replace each character of the key in the same way as in step 2; 4. For each block of plaintext, replace each character with the integer code value obtained by the sum of the corresponding integer code and the integer code of the character at the corresponding position in the key, modulo 27; 5. Replace the integer code in the result of step 4 with its equivalent character.

[0039] Specifically, this relates to a pet collar based on an embedded trusted spatiotemporal module, comprising: a positioning box, an embedded trusted spatiotemporal module, a control module, a power module, a charging port, a collar strap, a far-infrared generator, and a buckle. The embedded trusted spatiotemporal module internally includes a BeiDou / network communication module, an MCU core processing unit, an input / output module, and a power module. The output of the BeiDou / network communication module is electrically connected to the input of the MCU core processing unit; the output of the MCU core processing unit is electrically connected to the input of the input / output module; the output of the input / output module is electrically connected to the input of the MCU core processing unit; the BeiDou / network communication module, the MCU core processing unit, and the input / output module are each electrically connected to the power module. The control module and power module are sequentially installed on the left, center, and right sides inside the positioning box. The charging port is installed on the right center of the front face of the positioning box. A collar strap is installed on the lower part of each of the left and right sides of the positioning box. Several far-infrared generators are evenly embedded on the inner side of each collar strap. The other end of the two collar straps is respectively equipped with male and female buckles. The output terminal of the input / output module inside the embedded trusted time and space module is electrically connected to the input terminal of the control module. The output terminal of the control module is electrically connected to the input terminal of the input / output module inside the embedded trusted time and space module and the input terminal of the far-infrared generator. The charging port is electrically connected to the power module. The power module is electrically connected to the power module, control module, and far-infrared generator inside the embedded trusted time and space module.

[0040] Furthermore, the charging port is equipped with a waterproof rubber plug;

[0041] The BeiDou / network communication module inside the embedded trusted time and space module is responsible for receiving various standard time sources, the MCU core processing unit is responsible for performing time verification, the input / output module is responsible for time usage and external interaction, and the power module is responsible for powering the embedded trusted time and space module.

[0042] Working principle:

[0043] After receiving standard time and location signals from national standard time systems such as the National Time Service Center and BeiDou satellites, the Trusted Spatiotemporal Platform processes, marks, and saves these signals. The marked time and location signals are then sent to the terminal. Upon receiving the signals, the terminal marks them again and feeds back the double-marked time and location signals to the Trusted Spatiotemporal Platform for comparison. If the comparison is successful, the terminal takes action based on the time and location signals. If the comparison fails, the Trusted Spatiotemporal Platform sends new time and location signals to the terminal again until the comparison is successful.

[0044] Specific Implementation Example 2

[0045] A terminal two-way verification method based on low-frequency time code synchronization technology includes the following steps:

[0046] (1) The trusted spatiotemporal platform receives standard time and location signals from the National Time Service Center and the BeiDou Satellite National Standard Time System;

[0047] (2) The trusted spatiotemporal platform processes, marks, and saves the received standard time and location signals;

[0048] (3) After the trusted spatiotemporal platform completes the saving, it sends the tagged time and location signals to the terminal;

[0049] (4) After receiving the tagged time and location signal, the terminal tagged the signal again. The two tags were consistent, and the signal that had been tagged twice was fed back to the trusted spatiotemporal platform for comparison.

[0050] (5) The trusted spatiotemporal platform sequentially compares the time and location signals sent to the terminal with the time and location signals fed back by the terminal to see if they are consistent. If they are consistent, the platform sends a feedback message that the comparison is successful to the terminal. If they are inconsistent, the platform re-marks the time and location information and sends it to the terminal. After receiving the information, the terminal performs feedback comparison again until the comparison is successful.

[0051] (6) The terminal takes action based on the time and location information of the comparison.

[0052] Furthermore, the trusted spatiotemporal platform consists of a host computer, an embedded program, a server, an encoder, and an embedded encoding program. The embedded program is installed in the host computer and can receive and display the received time and space information, and act as a relay station to transmit the information to the lower-level terminal. The server is used to transmit and store the received and sent time and space information for comparison and verification. The embedded encoding program is installed in the encoder and can encode and mark the time and location information.

[0053] Furthermore, the trusted spatiotemporal platform processes the received standard time and location signals by means of an amplifier to select the frequency, amplify, filter and shape the received signals, and then extract, decode and restore them by a demodulation circuit.

[0054] Furthermore, the terminal has a built-in transceiver antenna, encoder, embedded encoding program and host computer. The transceiver antenna is used to transmit and receive signals. The embedded encoding program is installed in the encoder and can encode and mark time and position information. The host computer is used to process time and position signals and send feedback comparison signals to the trusted spatiotemporal platform.

[0055] Further, the encryption algorithm of the embedded encoding program is as follows: 1. Divide the plaintext into multiple blocks of the length of the key string, where the space character is represented by "+"; 2. Replace each character of the plaintext with an integer in the range of 0-26, where space character = 00, A = 01, ..., Z = 26; 3. Replace each character of the key in the same way as in step 2; 4. For each block of plaintext, replace each character with the integer code value obtained by the sum of the corresponding integer code and the integer code of the character at the corresponding position in the key, modulo 27; 5. Replace the integer code in the result of step 4 with its equivalent character.

[0056] Specifically, this invention relates to a surveillance camera based on an embedded trusted spatiotemporal module, comprising: a fixed bracket, a rotating base, an angle adjustment bracket, a surveillance camera body, a camera module, a control module, an embedded trusted spatiotemporal module, and an antenna. The rotating base is mounted on the front end of the fixed bracket, the angle adjustment bracket is mounted on the upper surface of the rotating base, and the rear end of the lower surface of the surveillance camera body is mounted on the upper surface of the angle adjustment bracket. The camera module is installed inside the front end of the surveillance camera body, and the control module is installed inside the middle of the surveillance camera body. The embedded trusted spatiotemporal module internally includes a BeiDou / network communication module, an MCU core processing unit, an input / output module, and a power supply module. The output terminal of the BeiDou / network communication module is electrically connected to the input terminal of the MCU core processing unit, and the output of the MCU core processing unit... The input terminal of the camera module is electrically connected to the input terminal of the input / output module. The output terminal of the input / output module is electrically connected to the input terminal of the MCU core processing unit. The Beidou / network communication module, the MCU core processing unit, and the input / output module are electrically connected to the power module. The embedded trusted spatiotemporal module is installed inside the rear of the main body of the surveillance camera. Two antennas are installed on the rear of the left and right sides of the main body of the surveillance camera. The output terminal of the camera module is electrically connected to the input terminal of the control module. The output terminal of the input / output module inside the embedded trusted spatiotemporal module is electrically connected to the input terminal of the control module. The output terminal of the control module is electrically connected to the input terminals of the input / output module and the antenna inside the embedded trusted spatiotemporal module. The output terminal of the antenna is electrically connected to the input terminal of the Beidou / network communication module inside the embedded trusted spatiotemporal module.

[0057] Furthermore, the main body of the surveillance camera is formed in one piece;

[0058] Furthermore, the gap between the camera module and antenna and the main body of the surveillance camera is provided with waterproof adhesive;

[0059] The BeiDou / network communication module inside the embedded trusted time and space module is responsible for receiving various standard time sources, the MCU core processing unit is responsible for performing time verification, the input / output module is responsible for time usage and external interaction, and the power module is responsible for powering the embedded trusted time and space module.

[0060] Working principle:

[0061] After receiving standard time and location signals from national standard time systems such as the National Time Service Center and BeiDou satellites, the Trusted Spatiotemporal Platform processes, marks, and saves these signals. The marked time and location signals are then sent to the terminal. Upon receiving the signals, the terminal marks them again and feeds back the double-marked time and location signals to the Trusted Spatiotemporal Platform for comparison. If the comparison is successful, the terminal takes action based on the time and location signals. If the comparison fails, the Trusted Spatiotemporal Platform sends new time and location signals to the terminal again until the comparison is successful.

[0062] Specific Implementation Example 3

[0063] A terminal two-way verification method based on low-frequency time code synchronization technology includes the following steps:

[0064] (1) The trusted spatiotemporal platform receives standard time and location signals from the National Time Service Center and the BeiDou Satellite National Standard Time System;

[0065] (2) The trusted spatiotemporal platform processes, marks, and saves the received standard time and location signals;

[0066] (3) After the trusted spatiotemporal platform completes the saving, it sends the tagged time and location signals to the terminal;

[0067] (4) After receiving the tagged time and location signal, the terminal tagged the signal again. The two tags were consistent, and the signal that had been tagged twice was fed back to the trusted spatiotemporal platform for comparison.

[0068] (5) The trusted spatiotemporal platform sequentially compares the time and location signals sent to the terminal with the time and location signals fed back by the terminal to see if they are consistent. If they are consistent, the platform sends a feedback message that the comparison is successful to the terminal. If they are inconsistent, the platform re-marks the time and location information and sends it to the terminal. After receiving the information, the terminal performs feedback comparison again until the comparison is successful.

[0069] (6) The terminal takes action based on the time and location information of the comparison.

[0070] Furthermore, the trusted spatiotemporal platform consists of a host computer, an embedded program, a server, an encoder, and an embedded encoding program. The embedded program is installed in the host computer and can receive and display the received time and space information, and act as a relay station to transmit the information to the lower-level terminal. The server is used to transmit and store the received and sent time and space information for comparison and verification. The embedded encoding program is installed in the encoder and can encode and mark the time and location information.

[0071] Furthermore, the trusted spatiotemporal platform processes the received standard time and location signals by means of an amplifier to select the frequency, amplify, filter and shape the received signals, and then extract, decode and restore them by a demodulation circuit.

[0072] Furthermore, the terminal has a built-in transceiver antenna, encoder, embedded encoding program and host computer. The transceiver antenna is used to transmit and receive signals. The embedded encoding program is installed in the encoder and can encode and mark time and position information. The host computer is used to process time and position signals and send feedback comparison signals to the trusted spatiotemporal platform.

[0073] Further, the encryption algorithm of the embedded encoding program is as follows: 1. Divide the plaintext into multiple blocks of the length of the key string, where the space character is represented by "+"; 2. Replace each character of the plaintext with an integer in the range of 0-26, where space character = 00, A = 01, ..., Z = 26; 3. Replace each character of the key in the same way as in step 2; 4. For each block of plaintext, replace each character with the integer code value obtained by the sum of the corresponding integer code and the integer code of the character at the corresponding position in the key, modulo 27; 5. Replace the integer code in the result of step 4 with its equivalent character.

[0074] Specifically, this relates to a shared bicycle based on an embedded trusted spatiotemporal module, comprising: a shared bicycle, a warning light, a light intensity sensor, a smart lock protective shell, a QR code protective shell, an electric unlocking mechanism, a control and communication module, the trusted spatiotemporal module, and a power supply. The warning light is installed on the upper part of the rear fork of the shared bicycle frame. Two light intensity sensors are respectively installed on the front middle part of the left and right sides of the warning light. The smart lock protective shell is installed on the lower middle part of the rear fork of the shared bicycle frame. The QR code protective shell is installed on the lower middle part of the rear side of the smart lock protective shell. The electric unlocking mechanism, the control and communication module, the trusted spatiotemporal module, and the power supply are installed sequentially from bottom to top inside the smart lock protective shell. The trusted spatiotemporal module internally includes a Beidou / network communication module, an MCU core processing unit, an input / output module, and a power supply module. The output of the Beidou / network communication module is electrically connected to the input of the MCU core processing unit. The output of the MCU core processing unit is electrically connected to the input of the input / output module. The output of the input / output module is electrically connected to the input of the MCU core processing unit. The Beidou / network communication module, the MCU core processing unit, and the input / output module are all electrically connected to the power supply module. The output of the control communication module is electrically connected to the input of the electric unlocking mechanism and the input of the input / output module inside the trusted time and space module. The output of the input / output module inside the trusted time and space module is electrically connected to the input of the control communication module. The warning light, the light intensity sensor, the electric unlocking mechanism, the control communication module, and the power supply module inside the trusted time and space module are all electrically connected to the power supply.

[0075] Preferably, the gaps in the smart lock protective shell are provided with waterproof adhesive;

[0076] The BeiDou / network communication module inside the embedded trusted time and space module is responsible for receiving various standard time sources, the MCU core processing unit is responsible for performing time verification, the input / output module is responsible for time usage and external interaction, and the power module is responsible for powering the embedded trusted time and space module.

[0077] Working principle:

[0078] After receiving standard time and location signals from national standard time systems such as the National Time Service Center and BeiDou satellites, the Trusted Spatiotemporal Platform processes, marks, and saves these signals. The marked time and location signals are then sent to the terminal. Upon receiving the signals, the terminal marks them again and feeds back the double-marked time and location signals to the Trusted Spatiotemporal Platform for comparison. If the comparison is successful, the terminal takes action based on the time and location signals. If the comparison fails, the Trusted Spatiotemporal Platform sends new time and location signals to the terminal again until the comparison is successful.

Claims

1. A terminal two-way verification method based on low-frequency time code synchronization technology, characterized in that, Includes the following steps: (1) The trusted spatiotemporal platform receives standard time and location signals from the National Time Service Center and the BeiDou Satellite National Standard Time System; (2) The trusted spatiotemporal platform processes, marks, and saves the received standard time and location signals; (3) After the trusted spatiotemporal platform completes the saving, it sends the tagged time and location signals to the terminal; (4) After receiving the tagged time and location signal, the terminal tagged the signal again. The two tags were consistent, and the signal that had been tagged twice was fed back to the trusted spatiotemporal platform for comparison. (5) The trusted spatiotemporal platform sequentially compares the time and location signals sent to the terminal with the time and location signals fed back by the terminal to see if they are consistent. If they are consistent, the platform sends a feedback message that the comparison is successful to the terminal. If they are inconsistent, the platform re-marks the time and location information and sends it to the terminal. After receiving the information, the terminal performs feedback comparison again until the comparison is successful. (6) The terminal takes action based on the time and location information of the comparison.

2. The terminal two-way verification method based on low-frequency time code synchronization technology according to claim 1, characterized in that: The trusted spatiotemporal platform consists of a host computer, an embedded program, a server, an encoder, and an embedded encoding program. The embedded program is installed in the host computer and can receive and display the received time and space information, and act as a relay station to transmit the information to the lower-level terminals. The server is used to transmit and store the received and sent time and space information for comparison and verification. The embedded encoding program is installed in the encoder and can encode and mark the time and location information.

3. The terminal two-way verification method based on low-frequency time code synchronization technology according to claim 1, characterized in that: The trusted spatiotemporal platform processes the received standard time and location signals by means of amplifiers to select frequencies, amplify, filter and shape the received signals, and then extract, decode and restore them through demodulation circuits.

4. The terminal two-way verification method based on low-frequency time code synchronization technology according to claim 1, characterized in that: The terminal has a built-in transceiver antenna, encoder, embedded encoding program and host computer. The transceiver antenna is used to transmit and receive signals. The embedded encoding program is installed in the encoder and can encode and mark time and position information. The host computer is used to process time and position signals and send feedback comparison signals to the trusted spatiotemporal platform.

5. A terminal two-way verification method based on low-frequency time code synchronization technology according to claim 2 or 4, characterized in that: The encryption algorithm of the embedded encoding program is as follows:

1. Divide the plaintext into multiple blocks of the length of the key string, where the space character is represented by "+"; 2. Replace each character of the plaintext with an integer in the range of 0-26, where space character = 00, A = 01, ..., Z = 26; 3. Replace each character of the key in the same way as in step 2; 4. For each block of plaintext, replace each character with the integer code value obtained by the sum of the corresponding integer code and the integer code of the character at the corresponding position in the key, modulo 27; 5. Replace the integer code in the result of step 4 with its equivalent character.

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