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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Provably Secure Higher-Order Masking of AES
verfasst von : Matthieu Rivain, Emmanuel Prouff
Erschienen in: Cryptographic Hardware and Embedded Systems, CHES 2010
Verlag: Springer Berlin Heidelberg
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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
≥ 3.