Microwave image transmission-oriented encryption synchronization method and system, and microwave image transmission equipment

Abstract

The application provides an encryption synchronization method and system for microwave image transmission and microwave image transmission equipment, relates to the technical field of data encryption and decryption, and comprises the following steps: collecting audio signals and video signals, and converting data frame formats; a transmitter transmits data in the data frame format to a security module through an interface corresponding to a preset mode for data encryption, and converts the encrypted data into microwave signals and transmits the microwave signals to the air; a receiver receives the microwave signals, converts the microwave signals, and returns the converted microwave signals to a security device for data decryption; and the decrypted data is encoded and recovered into audio signals and video signals; wherein, the data encryption of the security module and the data decryption of the security device are both realized based on a password synchronization code, different interfaces are used for different preset modes, and the data encryption and decryption are realized through the password synchronization code, so that the problems of single interface, insufficient sensitivity and high bit error rate are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of data encryption and decryption technology, and in particular to an encryption synchronization method, system and microwave image transmission equipment for microwave image transmission. Background Technology

[0002] Microwave image transmission system is a high-performance, high-quality wireless image and audio transmission system specifically designed for long-distance or wired transmission environments. Among them, microwave image transmission encryption system plays a core and key role in ensuring the security of microwave image transmission system.

[0003] The existing microwave image transmission system security and confidentiality equipment suffers from problems such as limited system interfaces, insufficient sensitivity, and high bit error rate. Summary of the Invention

[0004] This invention provides an encryption synchronization method, system, and microwave image transmission equipment for microwave image transmission, in order to solve the defects of existing microwave image transmission systems in terms of single interface, low sensitivity, and high bit error rate.

[0005] In a first aspect, the present invention provides an encrypted synchronization method for microwave image transmission, comprising:

[0006] Acquire audio and video signals and convert data frame formats;

[0007] The transmitter transmits the data in the data frame format to the security module for data encryption through the interface corresponding to the preset mode, and then converts the encrypted data into microwave signals for transmission into the air.

[0008] The receiver receives the microwave signal, converts it, and sends it back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio signal and the video signal.

[0009] The data encryption of the security module and the data decryption of the security device are both implemented based on cryptographic synchronization codes.

[0010] According to the present invention, an encrypted synchronization method for microwave image transmission is provided, wherein the cryptographic synchronization code is generated based on the transmission key pre-stored in the security and confidentiality module.

[0011] According to the encryption synchronization method for microwave image transmission provided by the present invention, the insertion method of the cryptographic synchronization code includes:

[0012] One byte of cipher synchronization code is inserted into each of the 32 consecutive data frames, with each data frame carrying only one byte of cipher synchronization code.

[0013] Based on the cryptographic synchronization code and the transmission key, a message key is generated and the image data frame to be sent is encrypted using the message key.

[0014] According to the encryption synchronization method for microwave image transmission provided by the present invention, the key data of the next encryption data segment is carried in the first encryption data segment.

[0015] According to the encryption and synchronization method for microwave image transmission provided by the present invention, the data encryption includes:

[0016] First, 32 invalid data frames are sent, each carrying a 1-byte cryptographic synchronization code. The 32 invalid data frames are encrypted and protected using a transmission key.

[0017] Starting from frame 32n+1, encrypted image data frames are sent, and the generated message key is used to encrypt the data content. Before sending the 32nd data frame, the message key to be used next time and a password synchronization code are generated. The password synchronization code required for the next synchronization is carried in the next 32 data frames. Starting from frame 32n+1, the new message key is used to encrypt subsequent data until the task is completed.

[0018] According to the encryption and synchronization method for microwave image transmission provided by the present invention, the data decryption includes:

[0019] Search for the synchronization code flag, and after receiving the first complete password synchronization code, use the pre-stored transmission key to decrypt it and extract its message key;

[0020] The message key is used to decrypt the subsequent 32 encrypted image data frames.

[0021] According to the encryption synchronization method for microwave image transmission provided by the present invention, when the data frame format is the standard TS stream data frame format, the interface corresponding to the preset mode is the ASI interface in the ASI working mode.

[0022] When the data frame format is a standard IP stream data frame format, the interface corresponding to the preset mode is the IP network port in IP working mode.

[0023] According to the encryption synchronization method for microwave image transmission provided by the present invention, the step of converting the encrypted data into a microwave signal includes:

[0024] The encrypted data is modulated into an intermediate frequency signal via a modem;

[0025] The intermediate frequency signal is converted into a microwave signal by a frequency converter.

[0026] Secondly, the present invention provides an encrypted synchronization system for microwave image transmission, comprising:

[0027] The acquisition module is used to acquire audio and video signals and convert data frame formats.

[0028] The encryption module is used by the transmitter to transmit data in the data frame format to the security module through the interface corresponding to the preset mode for data encryption, and to convert the encrypted data into microwave signals for transmission into the air.

[0029] The decryption module is used to receive the microwave signal, convert it, and send it back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio signal and the video signal.

[0030] The data encryption of the security module and the data decryption of the security device are both implemented based on cryptographic synchronization codes.

[0031] Thirdly, the present invention provides a microwave image transmission device for performing the encrypted synchronization method for microwave image transmission as described in any of the preceding claims.

[0032] Fourthly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the encrypted synchronization method for microwave image transmission as described above.

[0033] Fifthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the encrypted synchronization method for microwave image transmission as described above.

[0034] In a sixth aspect, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the encryption and synchronization method for microwave image transmission as described above.

[0035] This invention provides an encrypted synchronization method, system, and microwave image transmission device for microwave image transmission. The method includes acquiring audio and video signals and converting the data frame format; the transmitter transmits the data in the data frame format to a security module for data encryption through an interface corresponding to a preset mode, and converts the encrypted data into microwave signals for transmission into the air; the receiver receives the microwave signals, converts them, and sends them back to the security device for data decryption; the decrypted data is then encoded to recover the audio and video signals. The data encryption of the security module and the data decryption of the security device are both based on a cryptographic synchronization code. Because different preset modes correspond to different interfaces, and data encryption and decryption are achieved through a cryptographic synchronization code, the problems of single interface, insufficient sensitivity, and high error rate are effectively solved. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a flowchart illustrating the encrypted synchronization method for microwave image transmission provided in this embodiment.

[0038] Figure 2 This is a schematic diagram illustrating the principle of the encryption and synchronization method for microwave image transmission provided in this embodiment;

[0039] Figure 3 This is a schematic diagram of the structure of the encrypted synchronization system for microwave image transmission provided in this embodiment;

[0040] Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] Figure 1 This is a flowchart illustrating the encrypted synchronization method for microwave image transmission provided in this embodiment.

[0043] like Figure 1 As shown, the encryption and synchronization method for microwave image transmission provided in this embodiment of the invention mainly includes the following steps:

[0044] 101. Acquire audio and video signals and convert data frame formats.

[0045] In a specific implementation process, audio and video signals are first acquired using an image acquisition device. These signals are then compressed and decoded by an encoder, and the bitstreams are packaged into data frame formats for image transmission, including standard TS stream data frame formats and standard IP stream data frame formats. The microwave image transmission security and confidentiality device in this embodiment has both an ASI interface and an IP network interface, and supports both operating modes.

[0046] 102. The transmitter transmits the data in the data frame format to the security and confidentiality module through the interface corresponding to the preset mode for data encryption, and then converts the encrypted data into microwave signals for transmission into the air.

[0047] In ASI operating mode: the transmitter packages the bitstream into standard TS stream data frame format for image transmission and transmits the data to the security module via the ASI interface. The security module sends the encrypted TS stream data to the modem via the ASI interface, modulates it into an intermediate frequency signal, sends it to the inverter to be converted into a microwave signal, and then the antenna transmits the microwave signal into the air.

[0048] In IP working mode: the bitstream is packaged into a standard IP stream data frame format for image transmission, and the data is transmitted to the security and confidentiality module through the IP network port; the security and confidentiality module uses IP data packet encryption to send the encrypted IP stream data to the modem through the network port, modulates it into an intermediate frequency signal, sends it to the frequency converter to be converted into a microwave signal, and then the antenna transmits the microwave signal into the air.

[0049] 103. The receiver receives microwave signals, converts them, and then sends them back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio and video signals.

[0050] Correspondingly, in ASI operating mode: the working principle of the microwave video transmission receiver is the same as that of the transmitter. A stand-alone microwave video transmission security device can be deployed at the receiver, but the process is the reverse of the transmitter's operation. The receiver receives the microwave frequency, converts and demodulates it to form an encrypted TS data stream, which is transmitted through the ASI interface to the microwave video transmission security device for decryption. The decrypted TS data stream is then sent back to the receiver through the ASI interface. The receiver encodes the data and recovers the video and audio data, which can then be played on the display platform.

[0051] In IP operating mode: The receiver of the microwave video transmission system operates on the same principle as the transmitter, but the process is the reverse of the transmitter's operation. The receiver receives the microwave frequency, converts and demodulates it to form an encrypted IP data stream, which is transmitted through the network interface to the microwave video transmission security and confidentiality equipment for decryption. The decrypted IP data stream is then sent back to the receiver through the network interface, where it is encoded to recover the video and audio data, which can then be played on the display platform.

[0052] In this system, both data encryption in the security module and data decryption in the security device are based on cryptographic synchronization codes. The cryptographic synchronization method is the most crucial design element in the engineering implementation of cryptographic technology. Due to the limitations of its channel and bandwidth, the insertion method of the cryptographic synchronization code in microwave video transmission has a more significant impact on the system than in wired channels. A poor cryptographic synchronization insertion method will increase the information load on the wireless channel and reduce its communication efficiency, especially in systems with high real-time requirements such as microwave video transmission, ultimately leading to communication failure or a severe reduction in communication quality. Error correction coding can be added to the cryptographic synchronization code to perform error correction at the same bit error rate or under system-required zero bit error rate, ensuring the accuracy of the synchronization code during wireless channel transmission. This effectively solves the problem of error propagation caused by channel errors and synchronization code transmission errors leading to decryption failures.

[0053] Microwave image transmission systems have high requirements for real-time communication. To achieve cryptographic synchronization, a one-byte cryptographic synchronization code is inserted into each of the 32 consecutive data frames. Each data frame carries only one byte of cryptographic synchronization code data, and the key data for the next encrypted data segment is carried in the preceding encrypted data segment, ensuring continuous synchronous operation of the system. The cryptographic synchronization code is generated based on the transmission key pre-stored in the security module.

[0054] By deploying a security and confidentiality module in the microwave image transmission transmitter and a microwave image transmission security and confidentiality device at the receiving end, the microwave image transmission data of ASI data stream or IP data stream is protected with security and confidentiality. Using microwave transmission data stream password information fast synchronization technology, the microwave image transmission security and confidentiality system can quickly synchronize password resources after the encryption and decryption of the confidentiality device fails, ensuring the stability of the microwave image transmission system and solving the problems of existing microwave image transmission encryption systems such as single interface, insufficient sensitivity, and high bit error rate.

[0055] Specifically, when the transmitter is transmitting data, the transmitter's image encoder continuously sends the compressed audio and video data to the security module in the data stream frame format. When the transmitter is powered on, the security module uses the pre-stored transmission key to generate a password synchronization code. Using the password synchronization code and the transmission key, it generates a message key and encrypts the image data frames to be transmitted using the message key.

[0056] When the microwave image transmission system powers on and transmits data, it first sends 32 invalid data frames, each carrying a one-byte password synchronization code. These 32 frames are encrypted using a transmission key. Starting from frame 32n+1, encrypted image data frames are transmitted, using a generated message key to encrypt the data content. Before sending the 32nd data frame, a new message key and password synchronization code are generated for the next transmission, and these codes are carried in the subsequent 32 data frames. Starting from frame 32n+1, a new message key is used to encrypt subsequent data, and this process continues until the task is completed.

[0057] At the receiving end, the method for extracting the cryptographic synchronization code involves searching for the synchronization code flag, receiving the first complete cryptographic synchronization code, decrypting it using a pre-stored transmission key, extracting its message key, and then using this message key to decrypt the subsequent 32 encrypted image data frames. Using this method, synchronization can be restored after a maximum of 32 frames of data following a system failure, ensuring strong security and availability of the real-time image transmission security system.

[0058] Furthermore, this embodiment describes the process of generating a message key using the transmission key and the cryptographic synchronization code:

[0059] Logic for generating transmission keys and cryptographic synchronization codes

[0060] Unlike traditional methods that rely on an external key management center to distribute transmission keys, in this embodiment, the transmission key is automatically generated by the built-in hardware security module when the transmitter is powered on. The generation process combines the transmitter's unique hardware identifier and real-time startup parameters, and is processed by a key derivation function. This achieves hardware binding between the transmission key and the transmitter, reducing security risks in the external distribution process and solving the problems of easy interception and reuse in traditional key distribution.

[0061] The cryptographic synchronization code is generated based on the transmission key, overcoming the design limitation of existing synchronization codes that are not directly related to the transmission key. Specifically, the transmission key is first subjected to a secure hash operation to obtain a basic synchronization code. Then, the basic synchronization code is combined with the transmitter's current operating parameters (which have been encrypted) and a dynamic cryptographic synchronization code is generated through sequence transformation. This design establishes a strong correlation between the cryptographic synchronization code and the transmission key, ensuring the consistency of synchronization code generation between the sender and receiver, and improving the reliability of key synchronization.

[0062] Message key generation and verification mechanism

[0063] When generating the message key, the sender differs from the traditional simple processing method of a single hash or XOR operation. First, the transmission key is transformed using a symmetric encryption algorithm to obtain the intermediate key K1. Then, the cryptographic synchronization code is grouped into blocks of a preset length and subjected to bit-by-bit logical operations with K1 to generate the intermediate key K2. Finally, K2 is processed by a message authentication algorithm to output the message key. This two-layer transformation forms a strong coupling relationship between the "transmission key" and the "cryptographic synchronization code," significantly improving the key's collision resistance and enhancing the security of the message key compared to the traditional single transformation method.

[0064] Before retrieving the message key, the receiver must verify the legitimacy of the transmission key. After generating the transmission key, the transmitter automatically calculates its digital fingerprint and embeds a synchronization code prefix. When parsing the synchronization code, the receiver first extracts the fingerprint information and compares it with the locally generated transmission key fingerprint. Only after successful verification does it perform the same "double-layer nested transformation" as the sender. This design solves the pain point of traditional synchronization mechanisms where transmission key consistency relies on external verification. By embedding a fingerprint within the synchronization code, it achieves self-verification of key legitimacy, improving the efficiency and security of key verification.

[0065] Dynamic updates and security enhancement strategies

[0066] To overcome the security risks caused by the long-term fixed use of traditional message keys, this embodiment adopts a "multi-condition triggered update" mechanism: when a preset data volume threshold is met or the transmitter status changes (such as restarting), the transmission key is automatically regenerated, and the password synchronization code is updated in real time along with the new transmission key. When the new transmission key is generated, the hash value of the previous key is introduced as a seed parameter to form a key chain structure, ensuring the continuity and traceability of key updates, which is more flexible and secure than the traditional fixed-period update method.

[0067] Furthermore, an "environmental factor dynamic perturbation" technique is introduced into the key generation process. The transmitter's current physical parameters (such as temperature and voltage) are converted from analog to digital and used as a noise source to participate in the random number generation of the transmission key. This design overcomes the limitations of existing key generation methods that rely solely on algorithmic logic. By incorporating unpredictable environmental variables, it enhances the randomness and uniqueness of the transmission key, effectively resists side-channel attacks targeting the key generation algorithm, improves the key's resistance to physical attacks, and brings about a significant improvement in security.

[0068] Figure 2 This is a schematic diagram illustrating the principle of the encryption and synchronization method for microwave image transmission provided in this embodiment.

[0069] like Figure 1As shown, the system consists of a transmitter and a receiver. The transmitter sends microwave signals, and the receiver receives them. The transmitter acquires audio and video signals through a video acquisition device, compresses and encodes them using an encoder, and then inputs them to a security module based on different modes. The security module encrypts the signals before transmitting them through a modulation module, frequency converter, and power amplifier. The receiver receives the microwave signals and performs the reverse process: decrypting them using the security device, re-encoding them, and then outputting them to a display platform. During encryption, the encryption module inserts 32 password synchronization codes into the first 32 invalid data frames and encrypts them using a transmission key. Then, starting from frame 32n+1, it encrypts the image data frames to be transmitted using a message key, carrying the password synchronization code from the previous synchronization with the next synchronization, and using a new message key to encrypt subsequent data. This process continues until the task is completed, ensuring encryption security. Furthermore, multiple modes correspond to different interfaces, making the system more widely applicable compared to a single-interface mode and effectively improving the efficiency of encryption synchronization.

[0070] Based on the same general inventive concept, this invention also protects an encrypted synchronization system for microwave image transmission. The encrypted synchronization system for microwave image transmission described below and the encrypted synchronization method for microwave image transmission described above can be referred to in correspondence.

[0071] Figure 3 This is a schematic diagram of the structure of the encrypted synchronization system for microwave image transmission provided in this embodiment.

[0072] like Figure 3 As shown, this embodiment provides an encrypted synchronization system for microwave image transmission, comprising:

[0073] Acquisition module 301 is used to acquire audio and video signals and convert data frame formats;

[0074] Encryption module 302 is used by the transmitter to transmit data in data frame format to the security module through the interface corresponding to the preset mode for data encryption, and to convert the encrypted data into microwave signals for transmission into the air;

[0075] The decryption module 303 is used by the receiver to receive microwave signals, convert them, and then send them back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio and video signals.

[0076] The data encryption of the security module and the data decryption of the security device are both based on the cryptographic synchronization code.

[0077] Based on the same general inventive concept, the present invention also protects a microwave image transmission device for performing an encrypted synchronization method for microwave image transmission as described in any of the above embodiments.

[0078] Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0079] like Figure 4 As shown, the electronic device may include a processor 410, a communication interface 420, a memory 430, and a communication bus 440. The processor 410, communication interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute an encrypted synchronization method for microwave image transmission. This method includes: acquiring audio and video signals and converting the data frame format; the transmitter transmitting the data in the data frame format to the security module for data encryption through the interface corresponding to the preset mode, and converting the encrypted data into microwave signals for transmission; the receiver receiving the microwave signals, converting them, and transmitting them back to the security device for data decryption; and encoding the decrypted data to recover the audio and video signals. The data encryption of the security module and the data decryption of the security device are both based on a cryptographic synchronization code.

[0080] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a 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 the present invention. 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.

[0081] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the encryption and synchronization method for microwave image transmission provided by the above methods. The method includes: acquiring audio and video signals and converting the data frame format; the transmitter transmitting the data in the data frame format to the security module for data encryption through the interface corresponding to the preset mode, and converting the encrypted data into microwave signals for transmission into the air; the receiver receiving the microwave signals, converting them, and transmitting them back to the security device for data decryption, and encoding the decrypted data to recover the audio and video signals; wherein the data encryption of the security module and the data decryption of the security device are both based on cryptographic synchronization codes.

[0082] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements the encrypted synchronization method for microwave image transmission provided by the above methods. The method includes: acquiring audio and video signals and converting the data frame format; a transmitter transmitting the data in the data frame format to a security module for data encryption through an interface corresponding to the preset mode, and converting the encrypted data into microwave signals for transmission into the air; a receiver receiving the microwave signals, converting them, and transmitting them back to a security device for data decryption, and encoding the decrypted data to recover the audio and video signals; wherein the data encryption of the security module and the data decryption of the security device are both based on cryptographic synchronization codes.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0084] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An encrypted synchronization method for microwave image transmission, characterized in that, include: Acquire audio and video signals and convert data frame formats; The transmitter transmits the data in the data frame format to the security module for data encryption through the interface corresponding to the preset mode, and then converts the encrypted data into microwave signals for transmission into the air. The receiver receives the microwave signal, converts it, and sends it back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio signal and the video signal. The data encryption of the security module and the data decryption of the security device are both implemented based on cryptographic synchronization codes. The cryptographic synchronization code is generated based on the transmission key pre-stored by the security and confidentiality module; The method of inserting the password synchronization code includes: One byte of cryptographic synchronization code is inserted into each of the 32 consecutive data frames. Each data frame carries only one byte of cryptographic synchronization code. The key data of the next encrypted data segment is carried in the previous encrypted data segment. Based on the cryptographic synchronization code and the transmission key, a message key is generated and the image data frame to be sent is encrypted using the message key. The data encryption includes: First, 32 invalid data frames are sent, each carrying a 1-byte cryptographic synchronization code. The 32 invalid data frames are encrypted and protected using a transmission key. Starting from frame 32n+1, encrypted image data frames are sent, and the generated message key is used to encrypt the data content. Before sending the 32nd data frame, the message key to be used next time and a password synchronization code are generated. The password synchronization code required for the next synchronization is carried in the next 32 data frames. Starting from frame 32n+1, the new message key is used to encrypt subsequent data until the task is completed.

2. The encryption and synchronization method for microwave image transmission according to claim 1, characterized in that, The data decryption process includes: Search for the synchronization code flag, and after receiving the first complete password synchronization code, use the pre-stored transmission key to decrypt it and extract its message key; The message key is used to decrypt the subsequent 32 encrypted image data frames.

3. The encrypted synchronization method for microwave image transmission according to claim 1 or 2, characterized in that, When the data frame format is the standard TS stream data frame format, the interface corresponding to the preset mode is the ASI interface in the ASI working mode; When the data frame format is a standard IP stream data frame format, the interface corresponding to the preset mode is the IP network port in IP working mode.

4. The encrypted synchronization method for microwave image transmission according to claim 1 or 2, characterized in that, The process of converting the encrypted data into a microwave signal includes: The encrypted data is modulated into an intermediate frequency signal via a modem; The intermediate frequency signal is converted into a microwave signal by a frequency converter.

5. An encrypted synchronization system for microwave image transmission, characterized in that, include: The acquisition module is used to acquire audio and video signals and convert data frame formats. The encryption module is used by the transmitter to transmit data in the data frame format to the security module through the interface corresponding to the preset mode for data encryption, and to convert the encrypted data into microwave signals for transmission into the air. The decryption module is used to receive the microwave signal from the receiver, convert it, and send it back to the security and confidentiality equipment for data decryption. The decrypted data is then encoded to recover the audio signal and the video signal. The data encryption of the security module and the data decryption of the security device are both implemented based on a cryptographic synchronization code; the cryptographic synchronization code is generated based on the transmission key pre-stored by the security module. The method of inserting the password synchronization code includes: One byte of cryptographic synchronization code is inserted into each of the 32 consecutive data frames. Each data frame carries only one byte of cryptographic synchronization code. The key data of the next encrypted data segment is carried in the previous encrypted data segment. Based on the cryptographic synchronization code and the transmission key, a message key is generated and the image data frame to be sent is encrypted using the message key. The data encryption process performed by the encryption module includes: First, 32 invalid data frames are sent, each carrying a 1-byte cryptographic synchronization code. The 32 invalid data frames are encrypted and protected using a transmission key. Starting from frame 32n+1, encrypted image data frames are sent, and the generated message key is used to encrypt the data content. Before sending the 32nd data frame, the message key to be used next time and a password synchronization code are generated. The password synchronization code required for the next synchronization is carried in the next 32 data frames. Starting from frame 32n+1, the new message key is used to encrypt subsequent data until the task is completed.

6. A microwave image transmission device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the encrypted synchronization method for microwave image transmission as described in any one of claims 1-4.

Images