Using normal bases for compact hardware implementations of the AES S-box


Nikova, S.I. and Rijmen, V. and Schlaffer, M. (2008) Using normal bases for compact hardware implementations of the AES S-box. In: 6th International Conference Security in Communication Networks (SCN), 10-12 Sep 2008, Amalfi, Italy (pp. pp. 236-245).

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Abstract:The substitution box (S-box) of the Advanced Encryption Standard (AES) is based
on the multiplicative inversion $\inverse(x) = x^{-1}$ in GF(256) and followed
by an affine transformation in GF(2). The S-box is the most expansive building
block of any hardware implementation of the AES, and the multiplicative
inversion is the most costly step of the S-box transformation. There exist many
publications about hardware implementations of the S-box and the smallest known
implementations are based on normal bases. In this paper, we introduce a new
method to implement the multiplicative inversion over GF(256) based on normal
bases that have not been considered before in the context of AES
Item Type:Conference or Workshop Item
Additional information:Work done before joining UTwente
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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