摘要
提出一种基于变形分数阶Lorenz混沌系统并且结合频域Arnold置乱的图像加密算法,使用离散小波变换对图像进行多次滤波,置乱选取有参数的Arnold映射克服了周期性影响,采用非等长Arnold置乱解决了对明文图像尺寸的限制问题。密钥生成使用安全哈希算法SHA-256,分别产生置乱阶段和扩散阶段的密钥,增强了系统的抗差分攻击能力。性能仿真结果表明,提出的加密算法密钥空间大、密钥敏感性高、密文统计直方图分布均匀、相邻像素相关性低、信息熵接近于理想值、抗差分攻击能力强,具有较高的安全性。
An image encryption algorithm based on the deformed fractional Lorenz chaotic system combined with Arnold permutation in the frequency domain is proposed.The image was filtered many times by DWT,and Arnold transform with parameters was selected to overcome the periodic effect.The non-equal length permutation was adopted to solve the problem of restricting the size of plaintext image.The key generation used SHA-256,a secure Hash algorithm,to generate the key in the scrambling stage and the diffusion stage respectively,which enhanced the ability of the system to resist differential attack.The performance simulation shows that the proposed encryption algorithm has a large key space,high key sensitivity,uniform ciphertext statistical histogram,low correlation between adjacent pixels,information entropy close to ideal value and strong resistance to differential attacks.Therefore,the proposed algorithm has high security.
作者
马英杰
陈椟峣
赵耿
曾萍
郭超
Ma Yingjie;Chen Duyao;Zhao Geng;Zeng Ping;Guo Chao(Beijing Electronic Science and Technology Institute,Beijing 100070,China)
出处
《计算机应用与软件》
北大核心
2023年第2期308-313,共6页
Computer Applications and Software
基金
国家自然科学基金面上项目(61772047)。
