International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Provably Secure Higher-Order Masking of AES

Matthieu Rivain
Emmanuel Prouff
Search ePrint
Search Google
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 $d\geq 3$.
  title={Provably Secure Higher-Order Masking of AES},
  booktitle={IACR Eprint archive},
  keywords={implementation /},
  note={Full version of a paper published in the proceedings of CHES 2010. 14834 received 13 Aug 2010},
  author={Matthieu Rivain and Emmanuel Prouff},