基于OCML和TD-ERCS混沌系统的图像加密新方案

New image encryption scheme based on OCML and TD-ERCS map

研究了一个基于时空混沌系统和切延迟椭圆反射腔(TD-ERCS)离散混沌系统的图像加密方案。在该方案中,一类在时间和空间上均具有混沌行为的单向耦合映像格子(OCML)被分别用于图像的置乱和灰度值扩散,同时使用统计性良好的TD-ERCS混沌系统生成两个独立的伪随机序列赋给OCML系统的初值和耦合系数。该方案设计简单,能够实现任意大小图像的加密。数值实验和性能分析证明其具有很高的安全性。

This paper proposed a new image encryption scheme based on OCML and TD-ERCS map. In the proposed scheme, as a basic model of spatiotemporal chaotic system which exhibited chaotic properties both in time and in space, .one-way coupled map lattice was adopted in permutation and the diffusion of gray value. The initial values and coupling coefficients were produced by a TD-ERCS map which had good random properties. The simple designed encryption scheme could work on digital image at any size, while its high security is proved by statistical experiments.