Abstract
Traditional cipher systems are not appropriate for video encryption due to the high computation overhead. Video encryption must take account of the trade-off of both data security and real-time performance. In this paper, an efficient chaos pseudo-random number generator is designed to generate key stream for encrypting video syntax elements of H.264/AVC. In view of the efficiency and security, the intra-prediction mode (IPM), signs of trailing ones (T1s), signs of non-zero (NZ) coefficients, signs of motion vector difference (MVD) are chosen for selective encryption. The proposed scheme provides sufficient protection for the video commercial value. Experimental results demonstrate that the course of encryption will not affect the coding efficiency of H.264/AVC by keeping exactly the same bitrate and negligible time overhead. Security analysis shows that the proposed scheme has the ability to resist malicious attacks.
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