Singh Hukum, Yadav A K, Vashisth Sunanda, Singh Kehar
Appl Opt. 2014 Oct 1;53(28):6472-81. doi: 10.1364/AO.53.006472.
We propose a method for fully phase image encryption based on double random-structured phase mask encoding in the gyrator transform (GT) domain. The security of the system is strengthened by parameters used in the construction of a structured phase mask (SPM) based on a devil's vortex Fresnel lens (DVFL). The input image is recovered using the correct parameters of the SPMs, transform orders of the GT, and conjugate of the random phase masks. The use of a DVFL-based SPM enhances security by increasing the key space for encryption, and also overcomes the problem of axis alignment associated with an optical setup. The proposed scheme can also be implemented optically. The computed values of mean squared error between the retrieved and the original image show the efficacy of the proposed scheme. We have also investigated the scheme's sensitivity to the encryption parameters, and robustness against occlusion and multiplicative Gaussian noise attacks.
我们提出了一种基于双随机结构相位掩模编码的完全相位图像加密方法，该编码在旋转变换（GT）域中进行。通过基于魔涡菲涅尔透镜（DVFL）构建结构化相位掩模（SPM）时所使用的参数，增强了系统的安全性。利用SPM的正确参数、GT的变换阶数以及随机相位掩模的共轭来恢复输入图像。基于DVFL的SPM的使用通过增加加密密钥空间来提高安全性，并且还克服了与光学设置相关的轴对准问题。所提出的方案也可以通过光学方式实现。检索图像与原始图像之间的均方误差计算值表明了所提方案的有效性。我们还研究了该方案对加密参数的敏感性，以及对遮挡和乘性高斯噪声攻击的鲁棒性。
