随着网络的不断普及和发展,数字视频在网络中有了越来越多的应用,随之也提出了视频安全性问题,通过视频加密可以很好地解决此问题.为了满足网络对视频加密的要求,设计了一种可伸缩性视频加密的方案.考虑到小波的多尺度性,建立了一个基于小波变换的视频压缩平台,在此平台上进行了仿真加密实验,即在压缩的过程中从小波系数置乱、系数随机翻牌、运动矢量置乱等方面进行加密,并与其他算法进行了比较实验.实验结果表明,该方案具有加密效果好,密钥量较低,安全性好等优点,同时对压缩比和压缩效率有较好的保持,是一种高效的视频加密方案。

With the development of network, video has been widely used in it, and the security problem of video has been brought forward. We can solve the problem with video encryption. According to the requirement of network to video encryption, this paper proposed a new scalable encryption scheme. This paper set up a video compression system based on wavelet transform, encrypt on wavelet coefficients and motion vectors shuffling, sigh flipping in the encoder, and also compared the experimental results with other schemes. Those results show this scheme can get better encryption effect, be of less key cost and higher security. At the same time, it also has small impact on compression efficiency and compression ratio. It is a high efficiency scheme of video encryption.