Abstract:

Block-based digital video encoding generally include motion estimation, residual transformation and entropy encoding. Considering the traditional video encrypting schemes encrypt the coefficients of residual transformation, a new video encrypting scheme based on H.264 CABAC entropy coding is proposed in this paper. The proposed scheme makes the best of the advantage of stream cipher, and the process of encrypting is occurred in entropy encoding. Furthermore, CABAC encryption scheme uses flexible encryption modules and cipher feedback mode to increase the security. Theory analysis and experiment show that the proposed scheme has some advantages, such as low complex, high security, easy to implement and unchange the video format and compression efficiency.

Key words: video encrypting, H.264, entropy coding, CABAC