基于双置乱和C-R混沌系统的图像加密算法  

Image encryption algorithm based on double scrambling and C-R chaotic system

作　　者：马聪 王爱银 李国东[1] MA Cong;WANG Ai-yin;LI Guo-dong(School of Mathematics,Xinjiang University of Finance and Economics,Urumqi 830012,China)

机构地区：[1]新疆财经大学应用数学学院

出　　处：《计算机工程与设计》2019年第10期2773-2777,2784,共6页Computer Engineering and Design

基　　金：国家自然科学基金项目(11461063);国家社会科学基金项目(18BJL072);新疆维吾尔自治区自然科学基金项目(2017D01A24);新疆财经大学研究生科研创新基金项目(XJUFE2018K040)

摘　　要：针对混沌加密算法的安全性和复杂度问题,提出一种能够实现全局置乱及扩散的图像加密算法。利用chebyshev映射产生伪随机序列并进行索引位置排序,将变换后的图像均匀分块进行块的Arnold置乱;设计一种三维CNN-Rossler(C-R)混沌系统,对置乱后图像的每个像素值进行改变,将位置置乱图像与像素值置乱图像比特异或,得到密文图像。仿真结果表明,该算法具有很大密钥空间,具有很强抗攻击性和安全性。For the security and complexity of chaotic encryption algorithms,an image encryption algorithm that could achieve global scrambling and diffusion was proposed.The chebyshev mapping was used to generate pseudo-random sequences and sort the index positions.The transformed image was evenly transformed and Arnold scrambling of the block was performed.A threedimensional CNN-Rossler(C-R)chaotic system was designed.Each pixel value of the scrambled image was changed,and the position scrambled image was bitxored with the pixel value scrambled image to obtain a ciphertext image.Simulation results show that the proposed algorithm has large key space and it is highly resistant to attack and security.

关 键 词：CHEBYSHEV映射 ARNOLD置乱 C-R算法 混沌加密 比特异或 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]