CABAC Based H.264 Video Perceptual Encryption Algorithm with Adjustable Visual Quality
BAI Sen① GUO Yu①② ZHAO Bo① DAI Qinfang③
①(Chongqing Communication Institute, Chongqing 400035, China) ②(Unit 77108 of PLA, Chongzhou 611230, China) ③(Unit 78088 of PLA, Chongqing 400039, China)
In Video on Demand (VoD) applications it is desired that the encrypted multimedia data are still partially perceptible after encryption in order to stimulate the purchase of the high-quality versions of the multimedia products. This perceptual encryption requires specific algorithms for encrypting the video data. In this paper, a Context-based Adaptive Binary Arithmetic Coding (CABAC) video perceptual encryption scheme is designed. The video quality of this encryption scheme is controllable. The important syntax elements and sensitive coded elements are chosen to encrypt using mathematical XOR operations with stream ciphers generated by 2D hyper chaos system. The encryption scheme is composed of encrypting Motion Vector Differences (MVD) sign, non-zero coefficients sign and significant_coeff_flag. Theoretical analysis and experimental results show that the proposed scheme has no impact on bit rate. With the 7‰ encoding time increasing, the video quality can be controlled by the change of the quality factor, which meets the requirement of the video perceptual encryption.
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