Robust video encryption for H.264 compressed bitstream based on cross-coupled chaotic cipher

In order to realize the secure transmission of the H.264 compressed video bitstream, a detailed analysis of the structure for video bitstream is performed. The parameter set and frame header data related to video decoding are retained, and the slice data payload in the network abstraction layer unit is selected as the encryption object. The video format is compliant under the premise of real time and security. The novel cross-coupled chaotic system is designed as the key stream generation component, and the key stream is closely related to the plaintext through the synchronization vector mechanism. When part of the ciphertext stream is lost, the subsequent units can still be decrypted normally, which solves the problem of robustness encryption and decryption for video stream based on chaotic cipher. Detailed performance testing and security analysis data show that the proposed scheme has obvious advantages over existing research in terms of time overhead, compression ratio, anti-chosen-plaintext attack and robustness.