An image encryption scheme using bit-plane cross-diffusion and spatiotemporal chaos system with nonlinear perturbation.

In this paper, a dynamic coupled map lattices with nonlinear perturbations (NPDCML) is proposed. The test results show that the new spatiotemporal chaotic system has more obvious advantages than CML system in spatiotemporal performance and chaotic characteristics, and NPDCML system has larger parameter space and better cryptographic characteristics. Based on NPDCML system, a new image encryption scheme is proposed, which adopts the method of diffusion before confusion. After a round of diffusion, the image is scrambled by decomposing the bit plane, and the image is further encrypted by the way of mutual diffusion of high bit plane and low bit plane. Through the analysis of various test results, the encryption scheme can resist most common attacks, and it is proved that NPDCML system has good chaotic characteristics and cryptographic advantages. [ABSTRACT FROM AUTHOR]