A Compound Video Encryption Algorithm Based on Hyperchaos

A new video encryption algorithm is presented, which uses both stream ciphers to generate pseudorandom numbers and block ciphers to do permutation. The multi-dimensional chaotic function is used for the stream cipher encryption while the expanding Cat map is adopted for block cipher encryption. Among stream encryption some choices, such as encrypting DC, AC or motion vector coefficient, can meet different demands of speed and security classification. Over a number of analysis of Visual C++ programs, the new algorithm in this article exhibits an advantage that it can both support the high communication speed and satisfying security level.