Asian Journal of Physics Vol. 34, Nos 7 & 8 (2025) 517-529

An asymmetric cryptosystem for image quadrisection on fractional Fourier domain using structure phase mask

Hemant Kumar and Hukum Singh

Department of Applied Sciences, The NorthCap University, Gurugram-122 017, India

Dedicated to Prof Kehar Singh on the occasion of his 84th Birthday on July 3, 2025

This paper presents an image encryption technique where the image is divided into four equal parts, each undergoing a security analysis based on an asymmetric encryption technique. The approach incorporates random phase masks (RPMs) in the input plane, along with structured phase masks (SPM) generated using the radial Hilbert mask (RHM) and Fresnel zone plates (FZP) in the fractional Fourier domain. The use of RHM, FZP, and SPM enhances the cryptosystem’s key space, improving security and robustness. The primary objective of this cryptosystem is to enhance security by applying different combinations of masks to each image segment. RPMs, RHM, FZP and SPM play a crucial role in positioning during decryption, as decoding is impossible without the correct alignment and parameters. The sensitivity of encryption keys, including fractional Fourier transform (FrFT) parameters are analyzed through mathematical evaluation. The scheme’s effectiveness is assessed using structural similarity index measure (SSIM), entropy, mean square error (MSE), peak signal-to-noise ratio (PSNR), correlation coefficients (CC), and other computational techniques to compare the integrity and security of the original and encrypted images. © Anita Publications. All rights reserved.
Doi: xxx
Keywords: Radical Hilbert phase mask; Fresnel zone plates; Structured phase mask; Fractional Fourier transform

Peer Review Information
Method: Single- anonymous; Screened for Plagiarism? Yes
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