一种带扰动的高维混沌图像加密算法  

An Image Encryption Algorithm based on Perturbing High-dimension Chaotic Maps

作　　者：任帅[1] 高承实[1] 戴青[1] 

机构地区：[1]解放军信息工程大学电子技术学院,河南郑州450004

出　　处：《信息安全与通信保密》2011年第3期67-69,72,共4页Information Security and Communications Privacy

摘　　要：针对已有的部分混沌加密算法存在的问题,设计了一个带有扰动的高维混沌图像加密算法。通过对三维Lorenz系统添加扰动改善了序列的随机性,引入了三维猫映射对扩散后的图像进行置乱,并通过二次置乱来提高算法的安全性。分析与仿真结果表明,该算法具有较大的密钥空间,加密后图像像素值分布较均匀,相关系数接近于零,可以有效抵抗已知明文攻击。To solve the problem in existing image encryption algorithms based on chaotic system, a new image encryption algorithm based on perturbing high-dimension chaotic maps is designed. The new algorithm improves the random character of the Lorenz chaotic system by appending a new chaotic system to it. 3-D cat map is employed to scramble the diffused image, and thus to enhance the security of the new algorithm by scrambling twice. Analysis and simulation results show that the key space of the algorithm is large enough to resist the strong attack, and the pixel-value distribution of the encrypted image has a random-like behavior, and the values of adjacent pixels satisfy zero correlation. And thus it could effectively resist the image-known attack.

关 键 词：混沌 图像加密 扰动 三维猫映射 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]