标准映射和Lorenz混沌系统彩色图像加密算法

Color Image Encryption Algorithm Based on Standard and Lorenz Chaos System

基于标准映射和Lorenz混沌映射,针对RGB彩色图像,提出一种混沌加密算法。利用标准映射产生的非线性混沌序列,对图像像素位置进行置乱;利用Lorenz混沌系统的三维优势,结合彩色图像的R、G、B分量,对像素进行扩散。通过置乱和扩散两个步骤的混沌映射完成图像的加密,克服了单一加密安全性不高的缺点。相关实验和分析表明,该算法有良好的安全性和加密性能。

A double encryption algorithm of color image is proposed based on Standard map and Lorenz chaos system.Standard map was used to scramble the pixel position by its nonlinear feature.Lorenz chaos system was combined with R,G,B components of color image to diffuse pixels of image based on Lorenz＇s 3D feature.The double encryption is composed by scrambling and diffusing,which overcomes the weakness of single encryption in poor security.Experimental and analysis results prove that the proposed algorithm has higher security and encryption performance.