## CryptoDB

### Paper: Leakage Detection with the x2-Test

Authors: Amir Moradi , Horst Görtz Institute for IT Security, Ruhr-Universität Bochum Bastian Richter , Horst Görtz Institute for IT Security, Ruhr-Universität Bochum Tobias Schneider , ICTEAM/ELEN/Crypto Group, Université catholique de Louvain François-Xavier Standaert , ICTEAM/ELEN/Crypto Group, Université catholique de Louvain DOI: 10.13154/tches.v2018.i1.209-237 URL: https://tches.iacr.org/index.php/TCHES/article/view/838 Search ePrint Search Google We describe how Pearson’s χ2-test can be used as a natural complement to Welch’s t-test for black box leakage detection. In particular, we show that by using these two tests in combination, we can mitigate some of the limitations due to the moment-based nature of existing detection techniques based on Welch’s t-test (e.g., for the evaluation of higher-order masked implementations with insufficient noise). We also show that Pearson’s χ2-test is naturally suited to analyze threshold implementations with information lying in multiple statistical moments, and can be easily extended to a distinguisher for key recovery attacks. As a result, we believe the proposed test and methodology are interesting complementary ingredients of the side-channel evaluation toolbox, for black box leakage detection and non-profiled attacks, and as a preliminary before more demanding advanced analyses.
##### BibTeX
@article{tches-2018-28971,
title={Leakage Detection with the x2-Test},
journal={Transactions on Cryptographic Hardware and Embedded Systems},
publisher={Ruhr-Universität Bochum},
volume={2018, Issue 1},
pages={209-237},
url={https://tches.iacr.org/index.php/TCHES/article/view/838},
doi={10.13154/tches.v2018.i1.209-237},
author={Amir Moradi and Bastian Richter and Tobias Schneider and François-Xavier Standaert},
year=2018
}