【摘要】 探讨了基于ZigZag置乱的MPEG4视频数据加密技术,指出了这种方案在安全性方面的不足,提出了改进方案。改进的方案中AC系数用不同的置乱表置乱,DC系数用高强度的加密算法AES加密。最后给出了改进后的加密效果,并且从加密速度,安全性和码流变化三个指标衡量了该方案的应用价值。更多还原

【Abstract】 MPEG4 video encryption method by ZigZag permutation is introduced.Problems of this method is analyzed,and then an improved means is presented.In the improved means,AC coefficients are permuted by different permutation list.DC coefficients are encrypted with AES algorithm.At last,results are given,and application values are estimated in terms of security level,speed,and stream size changes.更多还原