一种鲁棒的H.264加密方案

本文所提出的一种鲁棒的H.264加密方案采用了帧内预测模式置乱、帧间预测模式置乱、整数变换系数加密和运动矢量加密.同时,为了降低计算复杂度和尽量不影响压缩比,该方案只对整数变换系数中拖尾系数（±1）符号位进行加密,以及对运行矢量选择加密.根据理论分析和实验结果表明,该方案具有较高的安全性和较好的实时性,几乎不影响压缩比,并且支持直接码率控制,误码弹性较好.

The Robust H.264 Encryption Scheme

The robust H.264 encryption scheme uses intra-prediction or inter-prediction mode decision scrambling transformation,integer transform coefficients encryption and motion vector encryption.For reducing computation complexity and compression ratio,the method just encrypts the sign bit of trailing coefficient（± 1） or encrypts partly the motion vector.According to the theoretical analysis and experimental result,this paper shows that the robust H.264 encryption scheme is of great safety and of real-time capability;it almost does not affect the compression ratio and supports direct bit-rate control and has good elasticity of BER.