中文摘要：

为了解决视频信息的安全问题，提出了一种基于视频编码标准H．264／AVC的混沌视频加密算法。利用流密码加密简单、运算速度快等优点，采用Logistic离散混沌序列对H．264／AVC标准的CAVLC（基于上下文的自适应变长编码）熵编码阶段的码流进行加密，并从算法的安全性、加密效率等方面进行分析。试验结果表明：该加密算法在保证视频内容信息安全性的前提下，不改变码流的结构，具有良好的实时性和快速性。

英文摘要：

In order to solve the problem of security of video information, a chaotic video encryption algorithm based on H.264/AVC video coding standard is proposed. Because Stream cipher is simple, fast, etc., The proposed scheme uses discrete chaotic sequence of Logistic to encrypt the stream of CAVLC （Context-based Adaptive Variable Length Coding） entropy coding stage of H.264/AVC, and analyses the security and encryption efficiency of the algorithm. The results showed that the video encryption algorithm ensures the security of information, does not change the structure of the stream and the system has a good real-time and fast speed.