Geodesic
On the representation of S-boxes in block ciphers
Prikladnaya Diskretnaya Matematika. Supplement, no. 6 (2013), pp. 30-32.

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A known method of S-boxes partition applied against side-channel attacks is considered. Nowadays, necessary partitions are found for all the affine equivalence classes except one. In the paper, it is proved that S-boxes of this class do not have admissible partition.
Keywords: S-box, vectorial Boolean function
Mots-clés : affine equivalence. 
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     title = {On the representation of {S-boxes} in block ciphers},
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V. A. Vitkup. On the representation of S-boxes in block ciphers. Prikladnaya Diskretnaya Matematika. Supplement, no. 6 (2013), pp. 30-32. http://geodesic.mathdoc.fr/item/PDMA_2013_6_a14/

[1] Bilgin B., Nikova S., Nikov V., et al., “Threshold implementations of all $3\times3$ and $4\times4$ S-boxes”, CHES 2012, LNCS, 7428, 2012, 76–91