A Characterization of Semi-Involutory MDS Matrices

• URL: http://arxiv.org/abs/2406.12842v1
• Date: Tue, 18 Jun 2024 17:57:46 GMT
• Title: A Characterization of Semi-Involutory MDS Matrices
• Authors: Tapas Chatterjee, Ayantika Laha,
• Abstract summary: In symmetric cryptography, maximum distance separable (MDS) matrices with computationally simple inverses have wide applications. Many block ciphers like AES, SQUARE, SHARK, and hash functions like PHOTON use an MDS matrix in the diffusion layer.
• Score: 3.069335774032178
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In symmetric cryptography, maximum distance separable (MDS) matrices with computationally simple inverses have wide applications. Many block ciphers like AES, SQUARE, SHARK, and hash functions like PHOTON use an MDS matrix in the diffusion layer. In this article, we first characterize all $3 \times 3$ irreducible semi-involutory matrices over the finite field of characteristic $2$. Using this matrix characterization, we provide a necessary and sufficient condition to construct MDS semi-involutory matrices using only their diagonal entries and the entries of an associated diagonal matrix. Finally, we count the number of $3 \times 3$ semi-involutory MDS matrices over any finite field of characteristic $2$.

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