基于伪随机序列的视频图像加密新算法

分析了视频序列的I，P帧传输特性，并针对该特性以及实时系统的延迟要求，提出了一种新的加密算法。在变换域中对直流分量引入基于伪随机序列的伪随机噪声，使其白化。该算法充分利用直流系数的方块效应，大大减少了计算量；同时，由于只改变直流系数，从统计特性上看，不会增加码率，这对系统的信道要求非常有利。最后，对整个加密、解密过程进行分析，对比其结果和信噪比。实验结果表明，该算法能有效地防止数据被窃取，并且不会使视频失真。

A New Encryption Algorithm for Digital Video Based on Pseudo-Random Sequence

The transferring characteristic of video signal is analyzed. According to the characteristic of I,P frame and the demand of real time system, a new video encryption algorithm is proposed. The encrypted signal is obtained by adding pseudo-random noise based on pseudo-random m-sequence to DC parameter in transferring field. Result of encrypting and decrypting process is also conducted and analyzed. It is proved that the algorithm is efficient and quite suitable for real-time video transferring.