SPARX - A Side-Channel Protected Processor for ARX-based Cryptography
Florian Bache1,a, Tobias Schneider2, Amir Moradi2 and Tim Güneysu1,3,b
1University of Bremen, Germany.
aflorian.bache@uni-bremen.de
btim.gueneysu@uni-bremen.de
2Horst Görtz Institute for IT Security, Ruhr-Universität Bochum, Germany.
ctobias.schneider-a7a@rub.de
damir.moradi@rub.de
3Cyber Physical Systems, DFKI GmbH, Bremen, Germany
ABSTRACT
ARX-based cryptographic algorithms are composed of only three elemental operations addition, rotation and exclusive or which are mixed to ensure adequate confusion and diffusion properties. While ARX-ciphers can easily be protected against timing attacks, special measures like masking have to be taken in order to prevent power and electromagnetic analysis. In this paper we present a processor architecture for ARXbased cryptography, that intrinsically guarantees first-order SCA resistance of any implemented algorithm. This is achieved by protecting the complete data path using a Boolean masking scheme with three shares.
We evaluate our security claims by mapping an ARX-algorithm to the proposed architecture and using the common leakage detection methodology based on Student's t-test to certify the side-channel resistance of our processor.
