基于三维混沌猫映射图像加密算法的改进

针对基于三维混沌猫映射的图像钥加密算法,提出了一种有效的改进算法。该算法使用随机扫描进行加密预处理,并在扩散过程和密钥产生器中分别使用双密钥和组密钥的方式,而且采用混沌物理量进一步衡量该加密系统的性能。仿真结果表明,该方法具有高置乱程度、良好的扩散性能和足够大的密钥空间,可获得足够高的安全性,不仅能抵抗差分攻击、选择明文攻击、统计攻击等,而且取得了复杂度和速度的良好折中,适合应用于实时的按安全级别加密的网络图像加密中。

Improving image encryption method based on three-dimensional chaotic cat map

An improving 3D cat map based chaotic image encryption method is presented,in which random scan as preprocessing of the encryption is used,double-key and group-key in diffusion and key generator are used respectively,and chaotic parameters to test the performance of the encryption system are adopted.Experiment results show that,this algorithm has high confusion,good diffusion,large enough key space and high secure,not only can resist differential attack,plain-text attack,statistic attack etc,but also take a good balance of the complexity and speed,especially fit for different security level instantaneous network image encryption.