基于二维CA和混沌系统的图像加密新算法  

Novel image encryption algorithm based on 2D cellular automata and chaotic system

作　　者：李玲[1] 王伟男[1] 李津杰[1] 

机构地区：[1]重庆邮电大学数理学院,重庆400065

出　　处：《计算机工程与设计》2012年第4期1280-1284,共5页Computer Engineering and Design

基　　金：重庆市教委科研基金项目(KJ100505);重庆邮电大学自然科学基金项目(A2009-31)

摘　　要：基于二维元胞自动机和Logistic混沌映射,提出了一种新的图像加密算法。该算法主要思想是采用Logistic映射设计一种非线性耦合结构来对明文像素矩阵进行置乱,然后在分析元胞自动机的混沌和密码学性质的基础上构造一个二维伪随机数矩阵来进行图像加密。仿真实验结果表明,该算法具有较大的密钥空间,对密钥具有极高的敏感性,密文具有良好的扩散和统计特性,可以有效地抵御穷举攻击、敏感性攻击以及统计攻击等。Based on 2D cellular automata and Logistic map, a novel image encryption is proposed. The proposed scheme utilizes Logistic map to construct a nonlinear coupling structure for scrambling the pixel matrix of the plain image. Then a pseudorandom number matrix is formed combining the chaotic characteristics of cellular automata. Simulation experiments and security analysis demonstrate that the proposed algorithm can reach a satisfactory encryption performance and has large enough key space. Fur- thermore, it is highly sensitive to the secret keys. The cipher image has excellent diffusion and statistical properties and could re- sist exhaustive attack, sensitive attack and statistical attack, etc.

关 键 词：元胞自动机 LOGISTIC映射 图像加密 穷举攻击 统计攻击 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]