基于变形分数傅里叶变换的六重密钥图像加密

Six Security Key For Image Encryption Based on Anamorphic Fractional Fourier Transform

提出一种利用变形分数傅里叶变换和双随机相位编码对图像加密的方法.对要加密的图像分别进行两次变形分数傅里叶变换和两次随机相位函数调制,使加密图像的密钥由原来两重增加到六重.利用全息元件,可以用光学系统实现这种加密和解密变换.计算机模拟结果表明,只有当六重密钥都完全正确时,才能准确地重建原图像,这种六重密钥加密方法提高了图像信息的安全保密性.

A new optical image encryption method using anamorphic fractional Fourier transform and double random phase encoding is proposed.In this method,the image is transformed two times with anamorphic fractional Fourier transform and modulated two times by random phase function in the original image plane and the fractional domain separately.The number of security keys is increased from two to six,so the security intensity can be improved greatly.This encryption and decryption method can be implemented by optical system using HOE.The digital computation experiment showed only when the six security keys are exactly right,can the original image be reconstructed.