Research on video encryption algorithm based on SM4-CFB mode

INTRODUCTION: There are challenges of video data leakage, unauthorized and misconnected devices, and the potential for illegal tampering of video surveillance information in current public security IP video surveillance systems. OBJECTIVES: To solve the problems, a video encryption scheme based on the Cipher Feedback (CFB) mode of the nationally recognized SM4 algorithm was proposed. METHODS: A complete video encryption and decryption process framework was designed. To verify the effectiveness of the scheme, an experimental platform was established, and multiple test video sequences with varying characteristics were selected. Comparative experiments and analysis were conducted with the AES-CFB and DES-CFB algorithms from multiple perspectives, including subjective visual characteristics, objective statistical characteristics, encryption efficiency (and anti-interference capability. RESULTS: The experimental results demonstrate that the proposed SM4-CFB video encryption scheme effectively destroys the statistical characteristics of video data, resulting in a visually scrambled video after encryption. Its encryption efficiency is comparable to that of AES and significantly higher than that of DES, meeting the requirements of real-time video transmission and demonstrating robustness to common interference during transmission. CONCLUSION: It is a secure, efficient, and practical video encryption solution.