Abstract
In this paper, a triple random phase encryption scheme in the Fresnel domain is presented in a 4f system. The scheme is an extension of the double random phase encoding scheme in the Fresnel domain. Firstly, the image is subjected to double random phase encoding in the Fresnel domain and thereafter, another random phase mask is bonded with it. The scheme is validated for grayscale and binary images. Cryptosystem is exposed to statistical attack in the form of histogram, 3-D plots and information entropy, and results reveal that scheme endures these statistical attacks. The sensitivity of the Fresnel parameters to their original values is also shown in the figures. A comparative analysis also performed to demonstrate that the proposed scheme is effective and provides enhanced security against known-plaintext and chosen-ciphertext attack as compared to double random phase encoding method in Fresnel domain.
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