Cryptology ePrint Archive: Report 2010/441
Provably Secure Higher-Order Masking of AES
Matthieu Rivain and Emmanuel Prouff
Abstract: Implementations of cryptographic algorithms are vulnerable to Side Channel Analysis (SCA). To counteract it, masking schemes are usually involved which randomize key-dependent data by the addition of one or several random value(s) (the masks). When $d$th-order masking is involved (i.e. when $d$ masks are used per key-dependent variable), the complexity of performing an SCA grows exponentially with the order $d$. The design of generic $d$th-order masking schemes taking the order $d$ as security parameter is therefore of great interest for the physical security of cryptographic implementations. This paper presents the first generic $d$th-order masking scheme for AES with a provable security and a reasonable software implementation overhead. Our scheme is based on the hardware-oriented masking scheme published by Ishai et al. at Crypto 2003. Compared to this scheme, our solution can be efficiently implemented in software on any general-purpose processor. This result is of importance considering the lack of solution for $d\geq 3$.
Category / Keywords: implementation /
Publication Info: Full version of a paper published in the proceedings of CHES 2010.
Date: received 13 Aug 2010
Contact author: matthieu rivain at gmail com
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Version: 20100817:100659 (All versions of this report)
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