一种快速的混沌图像加密算法的设计与分析  

Design and Analysis of a Fast Chaotic Image Encryption Algorithm

作　　者：杜一婷 叶瑞松[1] DU Yiting;YE Ruisong(Science College of Shantou University,Shantou,515063,China)

机构地区：[1]汕头大学数学系,汕头515063

出　　处：《网络新媒体技术》2021年第6期19-28,共10页Network New Media Technology

基　　金：国家自然科学基金项目(编号:11771265);广东省普通高校重点研究项目(编号:2019KZDXM034);广东省基础与应用基础研究基金项目(编号:20202002110000018)。

摘　　要：近年来,大数据的出现和云计算的快速增长,使得多媒体数据的安全加密技术成为研究热点。图像加密技术在军事图像数据库、保密视频会议、付费电视、健康管理系统、在线私人相册等许多应用中发挥着重要的作用。混沌理论具有和密码学要求一致的固有优点,使得基于混沌的图像加密算法得到了广泛的研究。本文设计实现了一种基于混沌理论的快速图像加密算法,并对算法的性能进行了检测和分析。在加密过程中,先利用斜帐篷映射产生和明文图像相关联的控制参数,再将图像灰度值矩阵分裂为两部分进行Arnold置乱,实现像素位置和灰度值的改变。灰度扩散时,用二维实参数Arnold映射产生密钥流,密钥流和图像像素值序列经过异或运算和模运算后得到密文图像的灰度值序列。实验分析发现,图像经过一轮加密即可满足安全性要求,算法加密性能和效率均较高。In recent years,with the emergence of big data and the rapid growth of cloud computing,the security encryption technology of multimedia data has become a research hotspot.Image encryption technology plays an important role in military image databases,secure video conferencing,pay TV,health management systems,online private albums and many other applications.Chaos theory has some inherent advantages which are consistent with the requirements of cryptography,so the image encryption algorithm based on chaos has been widely studied.In this paper,a fast image encryption algorithm based on chaos is designed and implemented.In the encryption process,the skew tent mapping is applied to generate control parameters while the gray value matrix of the image is split into two parts to conduct Arnold pixel scrambling.Specially,the control parameters are related to the plain image to improve the differential attack resistance of the encrypted image.In the process of grayscale diffusion,Arnold mapping of two-dimensional real parameter is used to generate the key stream.After XOR and modulo operations between the key stream and the image pixels’gray value,the cipher image is finally obtained.Experimental results show that the cipher image can meet the security requirements by only one round of encryption,meaning that the proposed algorithm owns good encryption efficiency and security performance.

关 键 词：图像加密 混沌 斜帐篷映射 ARNOLD映射 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]