Author

Dilshad Alghazzawi

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Open access Oct 2026

Ramanujan expander networks for authenticated grayscale image encryption

Image ciphers are usually proposed with a fixed battery of statistical indicators, and the numbers reported for competing designs are almost never produced under the same conditions, on the same pictures, with the same code. We address that gap for one family of designs and propose a cipher whose components come from p...

A. Razzaque, A. Razaq, Dilshad Alghazzawi et al. · PLoS ONE · 0 citations

Open access Sep 2026

A two-stage algebraic framework for designing cryptographically strong S-boxes for secure image encryption

A new, two-step approach to the construction of highly nonlinear S-boxes, with group-theoretic underpinnings, and is incorporated into a multi-round grayscale image-encryption scheme based on fixed S-box substitution, key- and nonce-dependent position permutation, SHA-256-based keystream whitening, and a final bidirect...

A. Razzaque, Hafiza Zara Mustafa, Dilshad Alghazzawi et al. · PLoS ONE · 0 citations