arXiv cs/05090352005-09cs.MMcs.CR

基于秘密霍夫曼表的MPEG视频加密方案的密码学分析

Cryptanalysis of an MPEG-Video Encryption Scheme Based on Secret Huffman Tables

Shujun Li, Guanrong Chen, Albert Cheung, Kwok-Tung Lo

备注：: 8 pages, 4 figures
发表信息：: Advances in Image and Video Technology - Third Pacific Rim Symposium, PSIVT 2009, Tokyo, Japan, January 13-16, 2009. Proceedings, Lecture Notes in Computer Science, vol. 5414, pp. 898-909, 2009
DOI：: 10.1007/978-3-540-92957-4_78

摘要：

本文研究了最近提出的一种基于秘密霍夫曼表的MPEG视频加密方案的安全性。我们的密码分析表明：1）加密方案的密钥空间不足以抵抗分治（DAC）攻击和已知明文攻击; 2）可以用部分已知密钥解密密文视频，从而在某些情况下显著降低DAC蛮干攻击的复杂度; 3）其抵抗选择明文攻击的安全性非常弱。文中给出了一些实验结果来支持密码分析结果，并简要讨论了如何改进这种MPEG视频加密方案。

英文摘要：

This paper studies the security of a recently-proposed MPEG-video encryption scheme based on secret Huffman tables. Our cryptanalysis shows that: 1) the key space of the encryption scheme is not sufficiently large against divide-and-conquer (DAC) attack and known-plaintext attack; 2) it is possible to decrypt a cipher-video with a partially-known key, thus dramatically reducing the complexity of the DAC brute-force attack in some cases; 3) its security against the chosen-plaintext attack is very weak. Some experimental results are included to support the cryptanalytic results with a brief discuss on how to improve this MPEG-video encryption scheme.

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