Description
Introduction
- Measuring the thermal component of clock jitter as an entropy source for True Random Number Generators (TRNGs) is compulsory for the security and evaluation of clock-jitter based TRNGs. However, identifying and isolating the local thermal noise component from other noise sources, particularly flicker noise, while performing a precise measurement remains a challenge.
Current Techniques
- We present an overview of the most effective techniques currently available for measuring the thermal clock jitter component. However, even the best techniques may struggle to avoid the influence of flicker noise on their measurements. Consequently, their results risk representing an overestimation of the thermal jitter component.
Characterizing Clock Jitter
- We present state-of-the-art methods for distinguishing between flicker noise and thermal noise components of a random signal while introducing their problems when applied to the evaluation of TRNGs.
Conclusion
- Despite advancements, current clock jitter measurement techniques should be used cautiously.
Practical infos
Next sessions
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HDL simulation for Masked Software Verification
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Masking is a countermeasure against Side-Channel Attacks (SCA) that aims to ensure that intermediate computations in an algorithm have secret-independent distributions through the use of random variables. This theoretically prevents SCAs, as power consumption is directly linked to the values manipulated by the program or hardware device. Designing a masking scheme is often non-trivial, and a[…]-
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Étude, caractérisation et détection de verrouillage d'anneaux oscillants utilisés dans les générateurs de nombres aléatoires.
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Embedded programs (including those on smart cards) are often developed in C and then compiled for the embedded processor. Sometimes they are modified by hand to incorporate countermeasures (fault attacks, etc.), but care must be taken to ensure that this does not disrupt normal program execution and that the countermeasure is actually adequate for blocking the attacks.In the process, it is[…]-
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Securing processor's microarchitecture against SCA in a post-quantum cryptography setting
Speaker : Vincent MIGLIORE - LAAS-CNRS
Hardware microarchitecture is a well-known source of side-channel leakages, providing a notable security reduction of standard cryptographic algorithms (e.g. AES) if not properly addressed by software or hardware. In this talk, we present new design approaches to harden processor's microarchitecture against power-based side-channel attacks, relying on configurable and cascadable building blocks[…]-
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Micro-architectural vulnerabilities
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