基于随机扩散和位级块置乱的图像加密算法  

Image Encryption Algorithm Based on Random Diffusion and Bit-Level Block Scrambling

作　　者：张汝汝 曹从军 周建 ZHANG Ru-ru;CAO Cong-jun;ZHOU Jian(College of Faculty of Printing,Packaging Engineering and Digital Media Technology,Xi’an University of Technology,Xi’an 710048,China;Key Laboratory for Harmful Components and Tar Reduction in Cigarette of Sichuan Province,Chengdu 610100,China)

机构地区：[1]西安理工大学印刷包装与数字媒体学院,西安710048 [2]卷烟减害降焦四川省重点实验室,成都610100

出　　处：《数字印刷》2021年第6期38-44,72,共8页Digital Printing

基　　金：西安市科技计划资助项目(No.2019217814GXRC014CG015-GXYD14.28);陕西省工程技术研究中心后补助项目(No.2019HBGC-55)。

摘　　要：针对当前图像信息在传播过程中隐私内容泄露导致的安全性问题,本研究提出了一种新的灰度图像加密算法。首先采用四维Henon映射迭代产生随机混沌序列用于随机扩散,以降低邻近像素点的相关性;然后采用Logistic映射产生用于控制置乱索引的混沌序列,实现在位平面内及位平面间的随机位级块置乱。相比传统图像加密算法一般采用逐像素置乱扩散,本研究的加密算法基于扩散-置乱结构的块算法,加解密过程简单,执行时间较短,且不会随着图像尺寸增大而大幅增加。仿真结果和安全实验分析表明,该加密算法密钥敏感性和安全性很高,能抵抗多种攻击手段。Aiming at the security problem of current image information caused by privacy disclosure in dissemination process, a new grayscale image encryption algorithm was proposed. Firstly, the four-dimensional Henon mapping was used to iteratively generate random chaotic sequences for random diffusion to reduce the correlation of neighboring pixels. Logistic mapping was then used to generate a chaotic sequence for controlling the scrambling index, so as to achieve random block scrambling in a bit plan and among bit planes. The traditional image encryption algorithm was generally per-pixel scrambling and diffusion. Encryption algorithm in this stady is a block algorithm based on the diffusion-scrambling structure. The encryption and decryption process is simple, the execution time is short and will not increase significantly as the image size increases. Simulation results and experimental analysis showed that the encryption algorithm has high key sensitivity and high security, it can resist multiple attack methods.

关 键 词：灰度图像加密 HENON映射 随机扩散 LOGISTIC映射 位级块置乱 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]