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Leakage assessment methodology. A clear roadmap for side-channel evaluations. (English) Zbl 1380.68171
Güneysu, Tim (ed.) et al., Cryptographic hardware and embedded systems – CHES 2015. 17th international workshop, Saint-Malo, France, September 13–16, 2015. Proceedings. Berlin: Springer (ISBN 978-3-662-48323-7/pbk; 978-3-662-48324-4/ebook). Lecture Notes in Computer Science 9293, 495-513 (2015).
Summary: Evoked by the increasing need to integrate side-channel countermeasures into security-enabled commercial devices, evaluation labs are seeking a standard approach that enables a fast, reliable and robust evaluation of the side-channel vulnerability of the given products. To this end, standardization bodies such as NIST intend to establish a leakage assessment methodology fulfilling these demands. One of such proposals is the Welch’s \(t\)-test, which is being put forward by Cryptography Research Inc., and is able to relax the dependency between the evaluations and the device’s underlying architecture. In this work, we deeply study the theoretical background of the test’s different flavors, and present a roadmap which can be followed by the evaluation labs to efficiently and correctly conduct the tests. More precisely, we express a stable, robust and efficient way to perform the tests at higher orders. Further, we extend the test to multivariate settings, and provide details on how to efficiently and rapidly carry out such a multivariate higher-order test. Including a suggested methodology to collect the traces for these tests, we point out practical case studies where different types of \(t\)-tests can exhibit the leakage of supposedly secure designs.
For the entire collection see [Zbl 1343.68011].

MSC:
68P25 Data encryption (aspects in computer science)
62G10 Nonparametric hypothesis testing
94A60 Cryptography
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