Research Of Video Encryption System Based On Chaotic Theory

According to the principles and features of chaos and the video-compression standard H.264, the thesis brings forward a video encryption scheme which the safety level is adjustable. The scheme generated an encryption sequence by a new piecewise-linear compound chaotic function, and then encrypted campaign vectors, forecasting models and DCT coefficient based on the security level. This algorithm was achieved in H.264 reference software JM10.2 at first. Then the author used VC + + / MFC to develope the video encryption system. The encryption strength is increased by the security level, encryption and compression process carried out simultaneously with high real-time and maneuverability.In addition, a new encryption algorithm based on chaos and lifting wavelet theory is put forward. The algorithm encrypts the wavelet decomposition of low-frequency sub-band texture block based on human visual characteristics. The algorithm only select a very small number of important factors to encrypt, it improves the real-time but not affect the security, and it is also simple to calculate, so it can be realized in hardware easily.