Abstract: A new chaotic encryption algorithm is presented to protect video security.The algorithm combines the Lorenz system map with double coupling Logistic map to generate the complicated chaotic sequences，and then uses XOR operator to encryption the multimedia AVI files.The results of simulation experiments，security analyses and efficiency analyses indicate that the algorithm has large key space and the capacity to resist the statistical analysis，differential attack，and it can provides an efficient and secure way for real-time video encryption and transmission.

Key words: video encryption, Lorenz system, double coupling Logistic mapping, compound chaotic systems

摘要： 为解决视频信息的安全问题，提出了一种新的混沌视频加密算法。算法将Lorenz系统和双耦合Logistic映射所产生的混沌序列以一种特定的方式产生复合混沌序列，通过异或操作实现了对多媒体视频流AVI文件加密。对算法进行了仿真，并从安全性和效率上进行了分析，实验结果表明，该算法密钥空间大且敏感性强，能抵抗统计分析、差分攻击，为视频加密及传输提供了一种安全而有效的方法。

关键词: 视频加密, Lorenz系统, 双耦合Logistic映射, 复合混沌序列