Quality Analysis of Several Typical MPEG Video Encryption Algorithms
Quality Analysis of Several Typical MPEG Video Encryption Algorithms
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作者：
Lian Shi
视频加密是保护视频数据的一种合适的方法。本文根据加密过程与压缩过程的关系，将现有的MPEG视频加密算法分为四种类型。它们是完全加密算法、部分加密算法、DCT系数加密算法和熵编码加密算法。从安全性、压缩比、计算复杂度和可操作性四个方面对每一种算法进行评价。理论分析和实验结果对这些算法进行了比较。并给出了它们的应用领域，与它们的性质相一致。根据视频应用的发展方向，今后将深入研究与编码过程相结合的加密算法，如DCT系数加密算法、熵编码加密算法或与纠错码相结合的新型算法等。
Video encryption is a suitable method to protect video data. In this paper, the existed MPEG video encryption algorithms are classified into four types according to the relationship between encryption process and compression process. They are complete encryption algorithm, partial encryption algorithm, DCT coefficient encryption algorithm and entropy encoding encryption algorithm. Each of them is evaluated from the four aspects: security, compression ratio, computing complexity and operationality. Theoretical analyses and experimental results are presented to compare these algorithms. And their application fields are given, which are consistent with their properties. According to the development direction of video application, the encryption algorithms combining with encoding process will be studied deeply in the future, such as DCT coefficient encryption algorithm, entropy encoding encryption algorithm or novel algorithm combining with error correcting code and so on.