基于多混沌系统的彩色图像加密方法  

Color image encryption method based on chaotic systems

作　　者：蒋君莉 张雪锋[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,西安710061

出　　处：《计算机应用研究》2014年第10期3131-3136,3140,共7页Application Research of Computers

基　　金：陕西省教育厅专项科研计划资助项目(12JK0498;12JK1008;2013JK1097);西安邮电大学青年基金资助项目(ZL2011-03;ZL2012-03)

摘　　要：为了提高彩色图像加密的安全性和加密性能,设计了一种基于多混沌系统的彩色图像加密方法。将一个彩色图像分解为R、G、B三个灰度图像,使用MD5算法动态生成加密算法的初始值,然后使用三种不同的基于混沌的加密结构对三个图像进行加密。对R图像使用Feistel结构加密,其中Feistel结构的S-盒由Logistic混沌序列和Hyperhenon混沌序列组合产生;对G图像使用由Lorenz系统产生加密序列对图像进行代替和置换操作的加密结构;对B图像使用由分段线性混沌映射产生加密序列,然后加密图像的加密结构,再把加密后的图像结合起来生成加密后的图像。理论分析和实验结果表明,该加密方法能够较为有效地保证彩色图像加密的安全性。In order to improve the security and encryption performance of the color image encryption method, this paper de- signed a color image encryption method based on chaotic systems. The MD5 algorithm generated dynamically the initial values of the designed algorithm. After decomposing the R, G and B components of one color image into three grayscale images ,it used three different chaotic encryption structures to encrypt the three images. It used Feistel structure to encrypt R image, the combi- nation of the Logistic and the Hyperhenon chaotic sequences obtained the S-box. The G image encryption structure took advan- tage of sequence of Lorenz chaotic system to implement replacement operation. B image encryption structure used the sequence of KWLCM chaotic system. Finally, it combined three encryption images into one image. The theoretical analysis and experi- mental results show that the encryption method can ensure the security of the encryption of the color image effectively.

关 键 词：多混沌系统 彩色图像加密 混沌序列 加密 安全性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]