Abstract
Advanced Side-Channel Analyses make use of dimensionality reduction techniques to reduce both the memory and timing complexity of the attacks. The most popular methods to effectuate such a reduction are the Principal Component Analysis (PCA) and the Linear Discriminant Analysis (LDA). They indeed lead to remarkable efficiency gains but their use in side-channel context also raised some issues. The PCA provides a set of vectors (the principal components) onto which project the data. The open question is which of these principal components are the most suitable for side-channel attacks. The LDA has been valorized for its theoretical leaning toward the class-distinguishability, but discouraged for its constraining greed of data. In this paper we present an in-depth study of these two methods, and, to automatize and to ameliorate the principal components selection, we propose a new technique named cumulative Explained Local Variance (ELV) selection. Moreover we present some extensions of the LDA, available in less constrained situations than the classical version. We equip our study with a comprehensive comparison of the existing and new methods in real cases. It allows us to verify the soundness of the ELV selection, and the effectiveness of the methods proposed to extend the use of the LDA to side-channel contexts where the existing approaches are inapplicable.
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Notes
- 1.
It can happen for example when attacking an RSA implementation, where the acquisitions are often huge (of the order of 1,000,000 points) and the number of measurements may be small when the SNR is good, implying that a good GE can be achieved with a small N.
- 2.
The name is due to the fact that it was proposed and tested for face recognition scopes.
- 3.
This study is let open for an extended version of this paper.
- 4.
This choice has been done to allow for reproducibility of the experiments.
- 5.
It consists in keeping the \(C\) first LDCs (the C last for the Direct LDA).
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Cagli, E., Dumas, C., Prouff, E. (2016). Enhancing Dimensionality Reduction Methods for Side-Channel Attacks. In: Homma, N., Medwed, M. (eds) Smart Card Research and Advanced Applications. CARDIS 2015. Lecture Notes in Computer Science(), vol 9514. Springer, Cham. https://doi.org/10.1007/978-3-319-31271-2_2
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