The Research Of Encryption Algorithm About H.264

With the development of computer technology, the cipher analysis technologyprogress, video data face more and more serious security threat. With h.264videocompression standards come out, video data security problems become more prominent.So in h.264features, how to improve the encryption technology, and join encrypttechnology and h.264together is the need to address the key problem.The video encryption technology involves two key data, one is residual coefficient,the other is motion vector. The law of the distribution of residuals coefficient related tovideo data compression efficiency. The safety of the residual coefficient andcompressing are contradictory, so improving one’s performance will affect anotherperformance. To solve this problem, based on the analysis of the Rijndael algorithm andthe CAVLC entropy coding, using Rijndael algorithm has make encrypted data to returnto its original position, the paper introduces the characteristic of using Rijndaelalgorithm to CAVLC entropy coding for encryption technology, so as to ensure thecoefficient of residual distribution rule. The experimental results show that under thepremise of the compression efficiency not affected, it effectively resolve the problem ofsafety in residual coefficient.For the motion vector encryption algorithm, consider the video data transmissionspeed, less data security considerations, and therefore less secure. Chaotic systems fordata encryption has a speed advantage, and sensitivity to the key characteristics,security algorithm of this paper, proposed folding chaotic cat maps encryption systemand superimposing chaotic cat maps encryption system. The results show that theimproved chaotic cat maps encryption system to advanced cryptanalysis such asstatistical attacks and differential attacks has a strong immunity.