Video Encryption Transmission in GCM Mode Based on SM4 Algorithm

The leakage of Tesla vehicle camera video and image data seriously infringes on users’ confidential information and personal privacy. Therefore, the security, reliability and privacy of video information in cameras have become one of the issues that all sectors of society pay more and more attention to, researchers mainly use AES encryption algorithm to encrypt video data. This paper takes the secure transmission of camera video data as the research object, and encrypts the original camera data by using Base64 coding and SM4 encryption algorithm, which can ensure the security and privacy of information data. The study compares six encryption modes of the SM4 algorithm and selects the GCM mode, which is more efficient and provides authentication functions. The encryption effect of the scheme was tested by using the microprocessor STM32F407 and OV2640 cameras, and the results showed that the encrypted transmission of video data and real-time decryption and playback could be completed, and the client video frame rate could reach 15fps, which effectively protected the user’s video privacy.