My interests revolve around the various facets of cryptography, with a particular focus on cryptologic algorithms related to number theory and algebraic geometry. Another aspect of my work relates to randomness and the blockchain technology.
2025
CNRS 2025 Bronze Medal
2024
Habilitation, École Normale Supérieure de Lyon (ENS Lyon)
2023
ERC Starting Grant AGATHA CRYPTY
2023
Secretary of the IACR, International Association for Cryptologic Research
2023
CNRS researcher, ENS Lyon
2020
CNRS researcher, Institut de Mathématiques de Bordeaux (IMB)
2019
Postdoc, Centrum Wiskunde en Informatica (CWI), The Netherlands
2018
PhD Thesis, École Polytechnique Fédérale de Lausanne (EPFL)
2014
Master’s degree in Mathematics, Minor in Information Security, EPFL
Experience
CNRS researcher, chargé de recherche2023–today · École normale supérieure de Lyon (ENS Lyon), Unité de Mathématiques pures et appliquées (UMPA), France
CNRS researcher, chargé de recherche2020–2022 · Institut de Mathématiques de Bordeaux (IMB), France
PostdocJan–Dec 2019 · Centrum Wiskunde en Informatica (CWI), Amsterdam, The NetherlandsCryptology Group, headed by Ronald Cramer.
Research engineerJul–Aug 2014 · Institute for Information and Communication Technologies, HEIG-VDDesign, proof of security, and implementation in C of a new efficient pairing-based broadcast encryption scheme.
Visiting student researcherFeb–Jun 2014 · University of California, BerkeleyStudy of the isogeny graphs of Jacobians of genus 2 curves, design and analysis of new algorithms for applications in hyperelliptic curve cryptography.
Teaching assistant2010–2018 · EPFLSupervising student projects and exercise sessions in topology, linear algebra, C and C++ programming, advanced calculus.
Education
Habilitation (HDR thesis)2024 · École Normale Supérieure de Lyon (ENS Lyon), FranceThesis title: Random Walks in Number-theoretic Cryptology.Reviewers: Steven D. Galbraith, Pierrick Gaudry and Hendrik W. Lenstra.Jury: Jean-Marc Couveignes, Pierrick Gaudry, Hendrik W. Lenstra, Sophie Morel (chair), Adeline Roux-Langlois, René Schoof.
PhD Thesis2014–2018 · EPFL, Laboratory for Cryptologic AlgorithmsAdvisors: Arjen Lenstra and Robert Granger.Thesis title: Arithmetic and geometric structures in cryptography.Jury: Ola Svensson (chair), Andreas Enge, Pierrick Gaudry and Zsolt Patakfalvi.
Master’s degree in Mathematics, Minor in Information Security2012–2014 · EPFL, thesis at the University of California, BerkeleyThesis advisors: Kenneth Ribet and Dimitar Jetchev.Thesis title: Walking on Isogeny Graphs of Hyperelliptic Curves of Genus 2.
Bachelor’s degree in Mathematics2009–2012 · EPFL
Supervision
PhD students
Thibault Monneret2025–ongoing · ENS Lyon · 50%Co-supervised with Aurel Page.
Etienne Piasecki2025–ongoing · ENS Lyon · 100%
Ilinca Radulescu2024–ongoing · ENS Lyon · 100%
Afonso Li2024–ongoing · Université de Bordeaux · 50%Co-supervised with Alice Pellet-Mary.
Pierrick Dartois2022–2025 · Université de BordeauxCo-supervised with Damien Robert. Now cryptography expert at DGA-MI.
Arthur Herlédan Le Merdy2022–2025 · ENS LyonCo-supervised with Guillaume Hanrot. Now postdoc at COSIC, KU Leuven.
Koen de Boer2019–2022 · Universiteit Leiden, The NetherlandsAs copromotor, co-supervised with Léo Ducas and Ronald Cramer. Now Actuarial Analyst at Quantum Leben.
Postdocs
Hansraj Jangir2026–ongoing · ENS Lyon
Maria Corte-Real Santos2025–ongoing · ENS Lyon
Harun Kir2024–ongoing · ENS Lyon
Teaching
Lectures
Elliptic curves in computational number theory24h · 2024–2025 · ENS Lyon
Algorithms for public-key cryptography12h · 2023–2024, 2024–2025 · ENS Lyon
Best paper award PKC 2025For the article “PRISM: Simple And Compact Identification and Signatures From Large Prime Degree Isogenies”.
Best paper award Eurocrypt 2024For the article “SQISignHD: new dimensions in cryptography”.
Top-3 paper Eurocrypt 2023For the article “A direct key recovery attack on SIDH”.
Best paper award Asiacrypt 2020For the article “SQISign: Compact Post-Quantum signatures from Quaternions and Isogenies”.
Best young researcher paper Eurocrypt 2019Darmstadt, GermanyFor the article “Efficient verifiable delay functions”.
Doctoral Program Thesis Distinction 2019EPFLGranted to “a selection of very high quality theses” (best 8%).
Top-3 paper Eurocrypt 2017For the article “Short Stickelberger class relations and application to Ideal-SVP”.
Teaching Assistant Award 2017EPFL
Doctoral EDIC Fellowship 2014EPFL
Kudelski Prize 2014Kudelski Group“For a Master Project having significantly contributed to the field of cryptography and information systems security”.
Douchet Prize 2014EPFLBest Master average in the Mathematics section at EPFL.
EPFL Prize 2014EPFL3rd (out of 872) best average mark for complete Master studies at EPFL, all sections included.
Undergraduate Awards 2013Dublin, IrelandHighly commended for the essay Lifting Braids: from Geometric Braids to Braid Groups (2012).