PhaseSCA: When Jitter Meets Electromagnetic Side Channels - LAAS - Laboratoire d'Analyse et d'Architecture des Systèmes
Article Dans Une Revue IACR Transactions on Cryptographic Hardware and Embedded Systems Année : 2025

PhaseSCA: When Jitter Meets Electromagnetic Side Channels

Pierre Ayoub
  • Fonction : Auteur
  • PersonId : 1097570
Aurélien Hernandez
  • Fonction : Auteur
  • PersonId : 1423580
Romain Cayre
Aurélien Francillon

Résumé

In recent years, the limits of electromagnetic side-channel attacks have been significantly expanded. However, while there is a growing literature on increasing attack distance or performance, the discovery of new phenomenons about compromising electromagnetic radiations remains limited. In this work, we identify a novel form of modulation produced by unintentional electromagnetic emanations: phase-modulated radiations. This observation allows us to extract a side-channel leakage that can be exploited to reveal secret cryptographic material. We introduce a technique allowing us to exploit this side-channel in order to perform a full AES key recovery, using cheap and common hardware equipment like a SDR. Moreover, we demonstrate that the exploitation of this new phase leakage can be combined with traditional amplitude leakage to significantly increase attack performance. While investigating the underlying phenomenon causing this unintentional modulation, we identified several prior works that have approached similar exploitation -- without being aware of each other. Creating a bridge between older and recent work, we unveil the relationship between digital jitter and signal phase shift in the context of side-channel attacks and fill the gap between prior works from various research fields.
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Dates et versions

hal-04726109 , version 1 (08-10-2024)

Identifiants

  • HAL Id : hal-04726109 , version 1

Citer

Pierre Ayoub, Aurélien Hernandez, Romain Cayre, Aurélien Francillon, Clémentine Maurice. PhaseSCA: When Jitter Meets Electromagnetic Side Channels. IACR Transactions on Cryptographic Hardware and Embedded Systems, In press. ⟨hal-04726109⟩
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