The paper proves that every non-MDS matrix admits related differentials, every odd-order symmetric MDS matrix admits them, most circulant matrices admit them, and gives an explicit 15-constraint criterion for 3x3 MDS matrices over finite fields.
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Analyzing Linear Layers in Related-Differential Cryptanalysis
The paper proves that every non-MDS matrix admits related differentials, every odd-order symmetric MDS matrix admits them, most circulant matrices admit them, and gives an explicit 15-constraint criterion for 3x3 MDS matrices over finite fields.