作　　者： ; ; ; ;

机构地区： 河南大学

出　　处： 《传感器与微系统》 2013年第8期131-134,138,共5页

摘　　要： 针对目前的数字图像加密多采用一个低维混沌系统,密钥空间小和序列复杂度不高,从而密码系统安全性不高的现状,提出了一种新的基于超混沌系统的彩色图像加密算法。首先,对原始彩色图像进行RGB三基色分离;然后,采用Lorenz混沌序列置乱图像像素位置;接着,采用Chen超混沌序列产生与明文相关的最终密钥序列扩散像素值,使得算法对明文敏感。对密钥空间、像素分布特性、相关系数、抗差分攻击能力、密钥敏感性进行了测试和分析,证明了算法的安全性。结果表明:该算法安全高效,在图像保密通信中具有巨大的应用潜力。 Aiming at present situation that digital image encryption algorithms mostly adopt a low dimensional chaotic system,the key space is small and sequence complexity is not high enough,thus the encryption system is not so secure,propose a new encryption algorithm for color image based on hyperchaotic systems.Firstly,separate the RGB three basic colors from the original color image.Secondly,scramble pixels position using Lorenz chaotic sequences.Then,diffuse pixels value using the final key sequence diffusion pixel value generated by Chen hyperchaotic sequences which is related to plaintext,which make the algorithm sensitive to plaintext.Performance test and security analysis are performed on key space,pixels distribution character,correlation coefficients,the ability to resist differential attack and key sensitivity test.Results show that the proposed algorithm is secure and high efficient,and has huge application potential in image secure communication.

关 键 词： 保密通信 图像加密 超混沌系统 彩色

领　　域： [自动化与计算机技术] [自动化与计算机技术]