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Multi-channel Attacks Dakshi Agrawal, Josyula R. Rao, and Pankaj Rohatgi

Summary: Multi-channel Attacks
Dakshi Agrawal, Josyula R. Rao, and Pankaj Rohatgi
IBM Watson Research Center
P.O. Box 704
Yorktown Heights, NY 10598
Abstract. We introduce multi-channel attacks, i.e., side-channel
attacks which utilize multiple side-channels such as power and EM
simultaneously. We propose an adversarial model which combines a
CMOS leakage model and the maximum-likelihood principle for per-
forming and analyzing such attacks. This model is essential for deriving
the optimal and very often counter-intuitive techniques for channel
selection and data analysis. We show that using multiple channels is
better for template attacks by experimentally showing a three-fold
reduction in the error probability. Developing sound countermeasures
against multi-channel attacks requires a rigorous leakage assessment
methodology. Under suitable assumptions and approximations, our
model also yields a practical assessment methodology for net infor-
mation leakage from the power and all available EM channels in
constrained devices such as chip-cards. Classical DPA/DEMA style


Source: Agrawal, Rakesh - IBM T.J. Watson Research Center


Collections: Computer Technologies and Information Sciences