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DCLSA:一种适用于H.264/AVC的?DCT系数分层置乱算法

DOI: 10.11834/jig.20080403

Keywords: H.264/AVC,DCT系数置乱,视频加密,密钥同步

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Abstract:

基于目前的DCT系数加密算法在安全性、压缩比和信噪比上都各自存在缺点,提出了一种新的适用于H?264/AVC的DCT系数分层置乱算法(DCLSA)。该算法针对H?264/AVC中4×4DCT变换的特点,首先将同一宏块中每个4×4块DCT系数进行块间分层,构建系数分层模型,然后可根据安全性要求对不同层系数进行随机置乱,实现加密编码。通过性能比较和具体实验效果分析,此算法具有更高的安全性、更优的压缩比和较好的信噪比,适合于H.264/AVC的网络安全应用。

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