基于混沌Gyrator变换与压缩感知的光学图像加密方法  

Optical image encryption based on chaotic gyrator transform and compressed sensing

作　　者：龙桂铃 汪绍荣 LONG Guiling;WANG Shaorong(Center of Network and Education Technology,Yichun University,Yichun,Jiangxi 336000,China)

机构地区：[1]宜春学院网络与教育技术中心,江西宜春336000

出　　处：《激光杂志》2023年第5期187-191,共5页Laser Journal

基　　金：江西省教育厅科技课题(No.GJJ 209932)。

摘　　要：为避免数字图像传输过程中受到密文攻击被破解与复制,提出基于混沌Gyrator变换与压缩感知的光学图像加密方法,利用Logistic映射迭代明文图像,使用Gyrator变换的光学结构加密压缩后的明文图像,并采用开关中值滤波消除加密图像的噪音。实验结果表明:使用本方法处理后的12幅激光图像在攻击发生时对应的相关系数更小,均≤0.028,且加密后图像的像素灰度级频率大致维持在250上下,分布相对最为均匀,证明该方法相对更能有效抵抗选择密文攻击和唯密文攻击,且加入消噪处理后更能显著提升加密图像的加密性能。In order to avoid being cracked and copied by ciphertext attack in the process of digital image transmis-sion,principles of compressed sensing and gyrator transform,an optical image encryption method based on chaotic gy-rator transform and compressed sensing is proposed.The plaintext image is iterated by logistic map,and the com-pressed plaintext image is encrypted by the optical structure of gyrator transform,the switching median filter is used to eliminate the noise of the encrypted image.The experimental results show that the correlation coefficients of the 12 la-ser images processed by this method are smaller when the attack occurs,both≤0.028,and the pixel gray level fre-quency of the encrypted image is roughly maintained at about 250,with the most uniform distribution.It is proved that this method is relatively more effective against the selected ciphertext attack and the ciphertext only attack,and can significantly improve the encryption performance of the encrypted image after adding noise elimination.

关 键 词：抵抗密文攻击 光学图像加密 压缩感知 Gyrator变换 混沌序列 开关中值滤波 

分 类 号：TN911[电子电信—通信与信息系统]