一种改进的基于广义猫映射的图像加密算法  

An improved image encryption algorithm based on the general cat map

作　　者：张红星[1] 张雪锋[1] 

机构地区：[1]西安邮电大学通信与信息工程学院,陕西西安710121

出　　处：《西安邮电学院学报》2012年第5期48-51,56,共5页Journal of Xi'an Institute of Posts and Telecommunications

摘　　要：为了对任意大小的数字图像进行加密,提出一种结合二维非等长图像置乱变换和logistic混沌映射的图像加密算法。该算法先使用二维非等长图像置乱变换对图像像素位置进行置乱,再利用logistic映射生成序列与图像的灰度值进行运算。实验结果表明,提出的算法可以得到良好的加密效果,且具有密钥空间大,敏感性强等特点。In order to encrypt the digital image with any size,an image encryption algorithm of a combination of the two-dimensional non equilateral image scrambling transformation and logistic chaotic map is proposed.Firstly,it use the two-dimensional non equilateral image scrambling transformation to scramble the image pixels’ position,and then use the chaotic sequence generated by the logistic chaotic map with the image pixels’ value to do calculations.The experimental results show that the proposed algorithm can get a good encryption,and has the large key space,key sensitivity and many other feathers.

关 键 词：混沌 图像加密 LOGISTIC映射 扩散 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]