基于菲涅耳变换的图像加密算法

摘要

针对相位截断加密算法无法抵御信息泄露问题,文章提出了一种基于相位截断菲涅耳变换与随机振幅掩模的加密算法,以抵御信息泄露问题;算法首先将原彩色图像分为3个独立的颜色通道,在对其进行菲涅耳变换后加入随机振幅掩模通道,将4个通道分别进行菲涅耳衍射截断处理;算法通过级联处理不仅提高了秘钥与密文间的关联性,还消除了信息泄露的风险;通过仿真试验与结果分析可知,本算法不仅在波长与自由空间传播错误距离参数、密文噪声、遮挡污染、密文泄露以及不同攻击等情况下有较好的鲁棒性,还解决了信息泄露问题.%As the phase truncation encryption algorithm can not resist the problem of information leakage,this paper proposes an encryption algorithm of phase truncation Fresnel transform and random amplitude mask in order to resist information disclosure.Firstly,the original image is divided into three separate color channels in the Fresnel transform after adding random amplitude mask channel,and then the four channels were Fresnel diffraction truncation.The algorithm not only improves the relevance between the secret key and the ciphertext also eliminates the risk of information leakage through the cascade process.Through simulation experiment and result analysis,this algo rithm not only has good robustness against the error distance parameter,the noise of the cipher,the pollution of the block,the leakage of the cipher and the different attack,but also solves the problem of information leakage.