A VIDEO ENCRYPTION ALGORITHM IN H.264 COMPRESSED DOMAIN FOR RESOURCE-LIMITED SYSTEMS
Niansheng Mao, Zhuo Li, Xiaoguang Li, Jing ZhangAbstract
Multimedia data security is one of the crucial issues for resource-limited systems, such as PAD and smartphones, where some private information is often stored. By taking limited processing power, memory and bandwidth of resource-limited systems into account, a novel video encryption algorithm in H.264 compressed domain is proposed in this paper, which is independent of the video compression and does not need to modify the structure of H.264 standard video codec. In order to optimize the tradeoff between security and computational complexity, the proposed algorithm selectively encrypts the codewords of intra-prediction modes, DCT coefficients and MVD in H.264 bitstream. Experimental results show that the proposed algorithm exhibits significant computational efficiency and reliable security, can resist not only perceptual attacks but also brute-force attacks. Moreover, it maintains the format compliance and has no impact on the compression efficiency.
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