节点文献
保持语义格式兼容的H.264/AVC视频加密算法
Format-compliant algorithm for H.264/AVC video encryption
【摘要】 针对以往视频加密研究成果不能直接适用于H.264的现状和保持语义格式兼容的难点问题,对H.264编码码流中量化步长、预测模式字、运动矢量和残差系数相关的重要信息进行了深入分析,提出了保持语义格式兼容的自适应的选择性加密方法;同时提出了一种将残差块按照其nC值和非零系数个数进行分组,然后在组内产生置乱码表,最后统一置乱的加密方法.实验结果表明:该加密算法在保证视频内容信息安全性的前提下,能保持语义格式兼容和码流大小不变,满足视频的实时传输.
【Abstract】 After key information in H.264 compressed stream,such as quant step,predictive mode,motion vectors and residual coefficients level were analyzed,corresponding format-compliant selective encryption schemes are proposed respectively.A format-compliant residual block spatial permutation scheme is also proposed.Residual blocks were categorized into different groups according to their nC values and numbers of total none-zero coefficients.Random shuffling table was generated in each residual block group respectively and residual blocks were permutated.The algorithm was composed of two parts: selective encryption and residual block spatial permutation.The experimental results show that H.264 compressed video stream could be encrypted in real-time while the format is kept compliant with the same stream size.
【Key words】 video encryption; H.264/AVC video encryption; format-compliant; selective encryption; video permutation;
- 【文献出处】 华中科技大学学报(自然科学版) ,Journal of Huazhong University of Science and Technology(Nature Science Edition) , 编辑部邮箱 ,2007年08期
- 【分类号】TN919.81;TN918.4
- 【被引频次】12
- 【下载频次】243