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Méthodologie et outils pour la mise en pratique des attaques par collision et attaques horizontales sur l'exponentiation modulaire

Abstract : This thesis is focused on the study of two sub-families of side channel attacks applied on modular exponentiation called respectively, collision based attacks and horizontal (or single shot) attacks. This study is made according to two axes: their applications and the possible countermeasures.Firstly, we study side channel attacks on a simulator developed during this thesis. This simulator allows to validate the good implementation of a any side channel attack before its application in a real environment.Secondly, we study collision based attacks in a real environment. For this purpose, we study the automation of collision detection in practice. Then, we introduce a new collision detection criterion and show its practical interest. Afterwards, we study the estimation of the signal to noise ratio in the context of side channel attacks. So, we introduce a fast and accurate method for its estimation during a side channel analysis. From our method we derive pragmatic and efficient methods for the daily tasks of evaluators. Among them the analysis of the electrical activity of integrated circuit or the identification of the frequencies carrying usable information or information leakage.Finally, through a detailed description of the main stages of an horizontal attack, we propose effective and practical solutions to improve secret information extraction in real environment and on the other hand possible countermeasures against the horizontal attacks applied on modular exponentiation.
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Submitted on : Friday, December 15, 2017 - 2:18:21 PM
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Ibrahima Diop. Méthodologie et outils pour la mise en pratique des attaques par collision et attaques horizontales sur l'exponentiation modulaire. Autre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSEM010⟩. ⟨tel-01665008⟩

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