基于真随机数和伪随机数相结合的图像加密算法  

An image encryption algorithm based on true random number and pseudo random number

作　　者：郭永宁[1] 孙树亮[1] GUO Yongning;SUN Shuliang(Engineering Research Center for ICH Digitalization and Multi-source Information Fusion(Fuqing Branch of Fujian Normal University),Fujian Province University,Fuqing 350300,Fujian,China)

机构地区：[1]非遗数字化与多源信息融合福建省高校工程研究中心(福建师范大学福清分校),福建福清350300

出　　处：《陕西师范大学学报（自然科学版）》2020年第2期52-57,共6页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：福建省自然科学基金(2018J01788);2017年福建省高校杰出青年科研人才培育计划;2018年福建省高等学校新世纪优秀人才支持计划。

摘　　要：针对具有较强相关性、冗余性和大数据量的图像,提出了基于真随机数和伪随机数相结合的图像加密算法。首先计算行、列置乱的迭代初始值,应用二维Logistic映射产生混沌序列;为了增强系统的安全性,采用扩展的异或操作,对图像进行行、列置乱;最后对图像进行扩散操作并获得加密图像。实验结果表明,提出的算法具有较高的安全性并能够抵御多种攻击。In order to process the image with for high correlation, high redundancy and enormous data, a new image encryption method has been devised based on true random number and pseudo random number. At first, initial conditions of row scrambling and column scrambling are calculated. Two-dimensional Logistic map is applied to generate chaotic sequences. Extended XOR is executed to enhance system security. Then, row scrambling and column scrambling are performed to improve system security. Finally, image diffusion is applied and encryption image is obtained. Experiment results and theoretical analysis prove that the proposed method is effective and can resist many kinds of attacks.

关 键 词：真随机数 伪随机数 扩展的异或操作 二维LOGISTIC映射 

分 类 号：TP391.411[自动化与计算机技术—计算机应用技术]