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.