基于组合混沌系统的彩色视频流加密算法

为进一步加强视频图像在存储及传输过程中的安全性,提出一种将两种改进的混沌系统和分组加密算法结合的彩色视频流加密方案.将原视频逐帧提取并取其RGB分量,并用改进的logistic混沌系统控制其高低位进行各分量位重组.再利用级联式二维猫映射,对亮度分量R实现快速空域置乱;通过改进型二维logistic映射构造的非线性混沌序列,对色度分量GB分量进行迭代扩散.然后将已加密的三分量通过AES算法进行二重加密.算法利用了高低维混沌的空域混合双重加密.仿真结果表明该算法的解密图像无损、无失真,具有更好的密钥敏感性、更好的安全性.

Color video stream encryption algorithm basedon multi-chaotic system

To further enhance the video or image storage and transmission security, the new video encryption scheme is proposed. The original video frame image and RGB three components are extracted to be controlled to each component bit restructuring with an improved logistic chaotic system. The use of two-dimensional cascade cat map complies R fast airspace scrambling; the improved two-dimensional nonlinear logistic chaotic sequence mapping converts GB of diffusion. Then the encrypted three-component is double-encrypted with the AES algorithm. Algorithm takes advantage of high and low dimensional chaotic mixing airspace double encryption. The simulation results show that the algorithm has better key sensitivity, better security.