视频哈希的安全性分析
doi: 10.3969/j.issn.0258-2724.2012.04.022
Security Analysis of Video Hashing
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摘要: 为了对鲁棒多媒体哈希的安全性进行定量分析,用Shannon的唯一解距离来解释鲁棒多媒体哈希的安全性.以一个典型的鲁棒视频哈希算法为例,对该算法的特征提取方式进行数学建模,并针对不同的攻击类型,用Shannon的唯一解距离测量该鲁棒视频哈希算法的安全级别,定量分析其安全性.分析结果表明:鲁棒视频哈希算法一个密钥的重复使用次数不能超过所求得的唯一解距离,否则,算法的密钥可以被估计出来.Abstract: In order to analyze the security of robust multimedia hashing quantitatively, Shannon's unicity distance was adopted to explain the security of robust multimedia hashing. A typical robust video hashing algorithm was used as an example, and a mathematics model for randomized feature extraction of the algorithm was found. Attacks for the typical video hashing algorithm were classified, and unicity distance, a concept proposed by Shannon, was adopted to measure the security level of the typical video hashing algorithm and analyze its security quantitatively. Theoretical analysis results show that the repeated use number of times of a robust video hashing algorithm's key cannot exceed the unicity distance, otherwise the key can be estimated.
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Key words:
- digital watermark /
- video hashing /
- security /
- unicity distance
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