## Cryptology ePrint Archive: Report 2015/527

Robust Profiling for DPA-Style Attacks

Carolyn Whitnall and Elisabeth Oswald

Abstract: Profiled side-channel attacks are understood to be powerful when applicable: in the best case when an adversary can comprehensively characterise the leakage, the resulting model leads to attacks requiring a minimal number of leakage traces for success. Such complete' leakage models are designed to capture the scale, location and shape of the profiling traces, so that any deviation between these and the attack traces potentially produces a mismatch which renders the model unfit for purpose. This severely limits the applicability of profiled attacks in practice and so poses an interesting research challenge: how can we design profiled distinguishers that can tolerate (some) differences between profiling and attack traces?

This submission is the first to tackle the problem head on: we propose distinguishers (utilising unsupervised machine learning methods, but also a down-to-earth' method combining mean traces and PCA) and evaluate their behaviour across an extensive set of distortions that we apply to representative trace data. Our results show that the profiled distinguishers are effective and robust to distortions to a surprising extent.

Category / Keywords: side-channel analysis, differential power analysis, machine learning

Original Publication (with major differences): IACR-CHES-2015

Date: received 1 Jun 2015, last revised 21 Sep 2015

Contact author: carolyn whitnall at bristol ac uk

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