基于耦合混沌和循环移位的彩色图像加密算法

Color Image Encryption Algorithm Based on Coupled Chaotic and Cyclic Shift

针对彩色图像RGB分量的特点,为了提高加密的安全性能,改写Logistic、Cubic、Chebychev映射构造耦合混沌加密系统,由Henon混沌映射生成行列和像素循环移位矩阵,实现像素位置置乱和像素值的置换;设计了密钥参数动态扰动数学模型、RGB分量的单独和联合加密方案.该算法钥密空间大且敏感性强,直方图均匀且相关性小.通过水印、自然和绘画书法图像的仿真试验,结果表明该算法能有效抵抗穷举、统计和差分攻击的能力,彩色图像加密安全性高.

According to the characteristics of the color image RGB components,in order to improve the security and performance of encryption,the coupling chaotic encryption system was proposed by the rewriting Logistic,Cubic,Chebychev map structure.The pixel position scrambling and pixel values of the displacement was realized by ranks and pixel cyclic shift matrix generated by Henon chaotic mapping.The dynamic perturbation mathematical model of key parameters,the single and union encryption scheme of RGB components were designed.The algorithm key space is large and sensitivity strong.The algorithm histogram was even and the correlation was small.The simulation test results of watermark,natural,calligraphy and painting image showed that the algorithm can effectively resist exhaustive,statistics and differential attack ability.The color image encryption security was higher.