A Small Depth-16 Circuit for the AES S-Box

Abstract : New techniques for reducing the depth of circuits for cryptographic applications are described. These techniques also keep the number of gates quite small. The result, when applied to the AES S-Box, is a circuit with depth 16 and only 128 gates. For the inverse, it is also depth 16 and has only 127 gates. There is a shared middle part, common to both the S-Box and its inverse, consisting of 63 gates. The best previous comparable design for the AES S-Box has depth 22 and size 148 [12].
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Joan Boyar, René Peralta. A Small Depth-16 Circuit for the AES S-Box. 27th Information Security and Privacy Conference (SEC), Jun 2012, Heraklion, Crete, Greece. pp.287-298, ⟨10.1007/978-3-642-30436-1_24⟩. ⟨hal-01518214⟩

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