基于Logistic和统一混沌系统的彩色图像加密方法

Color image encryption method based Logistic and unified chaotic system

为了增强彩色图像的加密效果,论文提出一种基于Logistic和统一混沌系统的彩色图像加密方法.该方法首先由Logistic系统生成128位Hash值以便在行、列全局位置置乱中确定各行和各列的交换次序,然后使用统一混沌系统的x、y和z序列分别对三基色图像像素进行逐点替代加密.仿真实验结果及其分析表明,该方法不仅实现简单,安全性强,具有良好的像素值混淆、扩散性能和较大抵抗强力攻击的密钥空间,而且加密图像像素值具有类随机均匀分布特性且相邻像素的值具有零相关特性.

In order to enhance color image encryption effect, a color image encryption method based Logistic and Unified Chaotic System was presented. The proposed method firstly generated 128-bit Hash keys by Logistic Chaotic System in the RGB components of the color image to determine the exchange order of rows and columns in global posi- tion scrambling of rows and columns. And then, it used the x, y, and z sequences of unified chaotic system respectively for three colors image pixel carry out alternative encryption point by point. Simulation results and analysis showed that this method was not only simple, strong security and prossessing a good confusion and diffusion properties of pixels and larger power{ul attack resistance key space, but also a random distri- bution characteristic of the pixel value of the encrypted image and the zero correlation of adjacent pixels.