摘要： 针对视频哈希中的单向性、唯一性以及鲁棒性等问题，对基于三维离散小波变换(3D-DWT)的视频哈希算法进行数学建模，利用密码学中的无条件安全性，证明该哈希算法具有单向性。计算参考哈希序列与所求哈希序列的汉明距离的概率密度，证明基于3D-DWT和基于三维离散余弦变换的视频哈希算法，在同等条件下均具有唯一性。结合理论和实验结果，分析2种算法在不同攻击下的鲁棒性，得出视频哈希的唯一性和鲁棒性是相互制约的结论。
关键词:
数字水印,
视频哈希,
单向性,
唯一性,
鲁棒性
Abstract: For unidirectional, uniqueness and robustness of robust video hashing, mathematical model is built for the video hashing scheme based on the 3D Discrete Wavelet Transform(3D-DWT), and the unidirectional of the scheme is proved, using the unconditionally secure of cryptology. It computes the probability density of hamming distance between the referenced hashing sequence and the calculated hashing sequence, and proves theoretically the uniqueness of the video hashing scheme based on 3D-DWT and the scheme based on 3D Discrete Cosine Transform(3D-DCT) under the same condition. According to the theoretical and experimental results, analyze the robustness of the two schemes under different attacks and conclude that the uniqueness and robustness of video hash are interact on each other.
Key words:
digital watermark,
video hash,
unidirectional,
unipolarity,
robustness
中图分类号:
刘丽, 李晓举, 李玲玲. 视频哈希的性能分析与测试[J]. 计算机工程, 2012, 38(06): 236-237.
LIU Li, LI Xiao-Ju, LI Ling-Ling. Performance Analysis and Test of Video Hash[J]. Computer Engineering, 2012, 38(06): 236-237.