H.264帧内预测宏块融合置乱技术安全通信研究

Fusion Scramble Research of Video Secure Communication Based on H.264 Intra Prediction Macroblock

基于I,P,B帧中所有帧内预测宏块与整数离散余弦变换DCT(Discrete Cosine Transform)提出了一种融合加密方案。判断当前宏块的属性是帧内预测宏块,则将其DCT系数分层即宏块系数矩阵进行转置变换,获得16个新的4×4子宏块,用混沌系统产生的密钥序列置乱子宏块后再加密子宏块中的系数符号。实验结果表明,该融合加密方案不仅能有效防止块间相关性攻击和密钥攻击,同时也能满足视频的安全性和传输的实时性要求。

Based on all intra prediction macroblock of I,P,B frame and integer Discrete Cosine Transform DCT（ Discrete Cosine Transform）,a fusion encryption scheme is put forward. If the current maeroblock is a intra prediction macroblock,layers DCT coefficient, mean macroblock coefficient matrix do transposed transformation,and gets 16 new sub-macroblocks. Chaotic system produces a sequence of keys to scramble macroblock and enerypt the co- efficient symbol of the sub-macroblocks. The result shows this fusion encryption scheme not only ean effectively prevent the block correlation attack and key attack, but also can meet the video security and real-time requirements.