Research on One Encryption Technology of Video File

Based on content-associated key technology, the paper designed and implemented an encryption algorithm for MP4 files. The algorithm first parses the MP4 file format to determine the position of the video data frame in the file, and uses the PWLCM chaotic mapping to determine the key extraction position in frames (or frame sets). In order to achieve better encryption effect, the Key frame / non-key frame hybrid extraction method is used to extract the corresponding data of each frame in the file, and to synthesize the key of the entire file. According to the playback effect of encrypted MP4 video, the algorithm is effective.