随着信息科学和计算机技术的发展,互联网上视频的商业应用,如视频点播、在线电影等变得越来越普及,同时对安全的要求也越来越迫切。为此,针对目前最新的视频压缩标准H.264的特点,提出了若干基于DCT(离散余弦变换)的视频加密算法,采用两个标准视频序列进行了算法仿真,并对各个算法的性能进行了比较分析。本文中所有的试验结果都在为H.264专门编写的JM(联合模型,版本7.3)软件平台上得到了验证。实验结果表明,这些算法基本不影响压缩效率,且用较低的复杂度得到了较好的加密效果。

With the development of information science and the computer technology,the application of video in commerce on the Internet,such as video on demand or video on line has become more and more common.At the same time,the demand for security becomes more and more urgent.According to the characteristics of the latest video compression standard H.264,this paper proposes several DCT-based encryption algorithms,conducts simulation on two standard video sequences,and analyzes and compares the quality of those proposed algorithms.The experimental results show that the proposed algorithms have no impact on the compression efficiency and have gained good encryption results with low complexity.The simulation results are all tested on JM(joint model,version 7.3) reference software,which is especially programmed for testing the coding standard of H.264.