基于混沌Gyrator变换与压缩感知的光学图像加密算法

An Optical Image Encryption Algorithm Based on Chaotic Gyrator Transform and Compressed Sensing

摘要:

为了增强光学加密技术的安全性与降低密文的数据容量,本文提出了基于混沌Gyrator变换与压缩感知的光学图像加密算法。首先,引入Logistic映射,利用明文特性 来生成其初值,利用其输出的混沌序列来生成压缩感知的测量矩阵；随后,基于压缩感知理论,对明文进行预处理,获取中间密文；利用logistic映射的随机序列来计算Gyrator变换的旋转角度，联合随机相位掩码，利用Gyrator变换方法对中间密文完成光学调制，得到最终密文。实验结果显示：与当前光学加密技术相比，所提算法具有更高的安全性与抗明文攻击能力。

Abstract:

In order to enhance the security of optical encryption technology and reduce the data capacity of cipher, an optical image encryption algorithm based on chaotic Gyrator transform and compressive sensing was proposed in this paper. Firstly, the plaintext characteristics were introduced to generate the initial value of Logistic map, and the output of chaotic sequences was used to generate two measurement matrices for compressed sensing. Then, based on compressed sensing theory, the intermediate cipher was got by using the compressed sensing theory to process the plaint. Finally, the rotation angle of Gyrator transformation was calculated by using the random sequence of logistic map. Finally, the intermediate cipher was fished optical modulation by jointing random phase mask to get the final cipher. The experimental results show that the proposed algorithm has higher security and anti plaintext attack capability compared with the current optical encryption technology.