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In this paper, the bit-sensitivity of H.264 bitstream has been studied firstly, to detect the most significant bits for video reconstruction. And then, an efficient video encryption scheme is presented. In the proposed scheme, the most significant bits in H.264 bitstream are directly extracted to be encrypted, including the codewords of intra-prediction modes, motion vector difference and the sign bits of the low frequency coefficients of intra-frames. Owing to the proposed scheme is independent of the compression process, thus does not need to modify the structure of the H.264 standard codec. Experimental results show that the proposed scheme exhibits reliable perceptual security, can secure against not only replacement attacks but also brute-force attacks, and achieves significant computational efficiency. Furthermore, it maintains the format-compliance to the H.264 standard decoder and has no escalation in bitrates.
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