一种彩色图像加密的新算法  

A Novel Encryption Algorithm for Color Image

作　　者：彭静玉[1] 赵鹤鸣[2] 

机构地区：[1]苏州大学应用技术学院,江苏苏州215325 [2]苏州大学电子信息学院,江苏苏州215006

出　　处：《通信技术》2017年第5期1050-1053,共4页Communications Technology

基　　金：江苏省自然科学基金(No.BK2011375);国家自然科学基金(No.61271359)~~

摘　　要：针对目前基于Arnold变换的图像加密方案中存在的不足,提出了一种新的分块加密方案。每块图像由相接或者相对的相邻像素组成,子块之间可以重叠,首尾相接。用混沌序列来初始化各子块加密顺序,并动态循环加密。加密运算直接采用二维和三维的Arnold变换来改变像素的位置和色彩分量,解密运算采用二维和三维的Arnold逆变换及先进后出的解密顺序。仿真实验表明,该算法具有较好的统计特性,密钥空间大,算法简单,图像的形状不再局限于正方形,而且适用彩色图像,是一种安全、实用的加密方案。Aiming at the defects of image encryption scheme based on Arnold transformation, a new block encryption scheme is proposed. Each image is composed by the adjacent pixels connected or face to face, and sub-block can be overlapped of between the head-tail. Chaotic sequence is used to initialize each sub- block encryption sequence and implement dynamic cycle encryption. Encryption algorithms with 2d and 3d Arnold transform are proposed to change the position of pixel and color component. Decryption algorithms are proposed with 2d and 3d Arnold inverse transformation and first in last out decryption order. Simulation experiments show that this method is of better statistical properties, large secret key space, simple algorithm, and the shape of the image is no longer limited to the square.h is applicable to color images, and proved to be a safe and practical encryption scheme.

关 键 词：图像分块 ARNOLD变换 图像加密 LOGISTIC映射 彩色图像 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]