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.

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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 implementations.
Item Type:	Conference or Workshop Item
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Distributed and Embedded Systems (DIES)
Link to this item:	http://purl.utwente.nl/publications/62504
Official URL:	http://dx.doi.org/10.1007/978-3-540-85855-3_16
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