Cryptology ePrint Archive: Report 2004/134
Secure and Efficient Masking of AES - A Mission Impossible?
Elisabeth Oswald and Stefan Mangard and Norbert Pramstaller
Abstract: This document discusses masking approaches with a special focus on the AES S-box. Firstly, we discuss previously presented masking schemes with respect to their security and implementation. We conclude that algorithmic countermeasures to secure the AES algorithm
against side-channel attacks have not been resistant against all
first-order side-channel attacks.
Secondly, we introduce a new masking countermeasure which is not only secure against first-order side-channel attacks, but which also leads to relatively small implementations compared to other masking schemes when implemented in dedicated hardware.
Category / Keywords: implementation / AES, implementation, side channel attacks
Date: received 4 Jun 2004
Contact author: Elisabeth Oswald at iaik tugraz at
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Version: 20040604:121931 (All versions of this report)
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