一种基于宏块数据划分的H.264视频加密方案

摘要

H. 264 is the most advanced video encoding standard, which is widely adopted in a variety of video applications. The security of the video becomes a very urgent problem to solve because of the convenience and popularity in video data transmission. In this paper, we propose a video encryption scheme for H. 264 based on macroblock data classification. We classify macroblocks into different groups,and use unequal encryption scheme to encrypt important macroblock data first. In the process, We combine several different fix-length elements to be encrypted, thus it can provide better security and keep format-compliant. The experiment demonstrated that our scheme can meet the requirements in real-time and security, so that it can protect the video data effectively.%H.264是最新的视频编码标准,被广泛地用于各种视频应用中.由于视频数据传输的广泛性和便易性,使得视频数据安全成了一个亟待解决的问题.提出一种在H.264编码下基于宏块重要性分类的加密方案,根据宏块重要程度的不同,运用不均等加密策略对重要宏块优先进行加密操作,减少加密的数据量.在具体的加密过程中,联合加密几种宏块语义层中的定长语法元素,在保持视频语义的情况下,提高了加密的安全性.理论和实验分析证明,该加密方案满足实时性和安全性的要求,有效地保护了视频安全.