I'm a researcher and entrepreneur, CEO at CryptoExperts, a service and technology company in cryptography. My current work involves several aspects of cryptography and its applications. This webpage is dedicated to my research activity.
News
- May 2025: Our paper Transistor: a TFHE-friendly Stream Cipher (joint work with Jules Baudrin, Sonia Belaïd, Nicolas Bon, Christina Boura, Anne Canteaut, Gaëtan Leurent, Pascal Paillier, Léo Perrin, Yann Rotella and Samuel Tap) has been accepted at CRYPTO.
- April 2025: First edition of CASCADE — the merged conference of CARDIS and COSADE — where I served as program co-chair.
- April 2025: Our paper SoK: A Methodology to Achieve Provable Side-Channel Security in Real-World Implementations (joint work with Sonia Belaïd, Gaëtan Cassiers, Camille Mutschler, Thomas Roche, François-Xavier Standaert and Abdul Rahman Taleb) has been accepted in IACR CiC.
- March 2025: Our paper Threshold Computation in the Head: Improved Framework for Post-Quantum Signatures and Zero-Knowledge Arguments (joint work with Thibauld Feneuil) has been accepted in Journal of Cryptology.
- February 2025: The 3-volume Embedded Cryptography book, which I co-edited, is now available from ISTE and Wiley.
- January 2025: Our paper New Techniques for Random Probing Security and Application to Raccoon Signature Scheme (joint work with Sonia Belaïd and Mélissa Rossi) has been accepted at EUROCRYPT.
- October 2024: The four post-quantum signature candidates that I co-submitted to NIST — MQOM, SDitH, RYDE, and Mirath — have been selected for Round 2. I'm also joining the PERK consortium as a Round 2 submitter.
Publications
Preprints
- SmallWood: Hash-Based Polynomial Commitments and Zero-Knowledge Arguments for Relatively Small Instances
Joint work with Thibauld Feneuil. - Blinding Post-Quantum Hash-and-Sign Signatures
Joint work with Charles Bouillaguet, Thibauld Feneuil, Jules Maire, Julia Sauvage, and Damien Vergnaud. - Masking-Friendly Post-Quantum Signatures in the Threshold-Computation-in-the-Head Framework
Joint work with Thibauld Feneuil and Auguste Warmé-Janville. - CAPSS: A Framework for SNARK-Friendly Post-Quantum Signatures
Joint work with Thibauld Feneuil.
2025
- Threshold Computation in the Head: Improved Framework for Post-Quantum Signatures and Zero-Knowledge Arguments - Journal of Cryptology
Joint work with Thibauld Feneuil. - Transistor: a TFHE-friendly Stream Cipher - CRYPTO
Joint work with Jules Baudrin, Sonia Belaïd, Nicolas Bon, Christina Boura, Anne Canteaut, Gaëtan Leurent, Pascal Paillier, Léo Perrin, Yann Rotella and Samuel Tap. - New Techniques for Random Probing Security and Application to Raccoon Signature Scheme - EUROCRYPT
Joint work with Sonia Belaïd and Mélissa Rossi. - RYDE: A Digital Signature Scheme based on Rank-Syndrome-Decoding Problem with MPCitH Paradigm - Designs, Codes and Cryptography
Joint work with Loïc Bidoux, Jesús-Javier Chi-Domínguez, Thibauld Feneuil, Philippe Gaborit, Antoine Joux and Adrien Vinçotte. - SoK: A Methodology to Achieve Provable Side-Channel Security in Real-World Implementations - IACR CiC
Joint work with Sonia Belaïd, Gaëtan Cassiers, Camille Mutschler, Thomas Roche, François-Xavier Standaert and Abdul Rahman Taleb.
2024
- Dual Support Decomposition in the Head: Shorter Signatures from Rank SD and MinRank - ASIACRYPT
Joint work with Loïc Bidoux, Thibauld Feneuil, Philippe Gaborit and Romaric Neveu. - Formal Definition and Verification for Combined Random Fault and Random Probing Security - ASIACRYPT
Joint work with Sonia Belaïd, Jakob Feldtkeller, Tim Güneysu, Anna Guinet, Jan Richter-Brockmann, Pascal Sasdrich and Abdul Rahman Taleb. - Optimized Homomorphic Evaluation of Boolean Functions - IACR TCHES
Joint work with Nicolas Bon and David Pointcheval. - OBSCURE: Versatile Software Obfuscation from a Lightweight Secure Element - IACR TCHES
Joint work with Darius Mercadier, Viet Sang Nguyen and Aleksei Udovenko. - MQ on my Mind: Post-Quantum Signatures from the Non-Structured Multivariate Quadratic Problem - EuroS&P
Joint work with Ryad Benadjila and Thibauld Feneuil.
2023
- Threshold Linear Secret Sharing to the Rescue of MPC-in-the-Head - ASIACRYPT
Joint work with Thibauld Feneuil. - Unifying Freedom and Separation for Tight Probing-Secure Composition - CRYPTO
Joint work with Sonia Belaïd, Gaëtan Cassiers and Abdul Rahman Taleb. - High Order Side-Channel Security for Elliptic-Curve Implementations - IACR TCHES
Joint work with Sonia Belaïd. - Shared Permutation for Syndrome Decoding: New Zero-Knowledge Protocol and Code-Based Signature - Designs, Codes and Cryptography
Joint work with Thibauld Feneuil and Antoine Joux. - White-Box Cryptography - Chapter in Encyclopedia of Cryptography, Security and Privacy
2022
- Zero-Knowledge Protocols for the Subset Sum Problem from MPC-in-the-Head with Rejection - ASIACRYPT
Joint work with Thibauld Feneuil, Jules Maire and Damien Vergnaud. - Syndrome Decoding in the Head: Shorter Signatures from Zero-Knowledge Proofs - CRYPTO
Joint work with Thibauld Feneuil and Antoine Joux. - IronMask: Versatile Verification of Masking Security - IEEE S&P
Joint work with Sonia Belaïd, Darius Mercadier and Abdul Rahman Taleb.
2021
- Dynamic Random Probing Expansion with Quasi Linear Asymptotic Complexity - ASIACRYPT
Joint work with Sonia Belaïd, Abdul Rahman Taleb and Damien Vergaud . - On the Power of Expansion: More Efficient Constructions in the Random Probing Model - EUROCRYPT
Joint work with Sonia Belaïd and Abdul Rahman Taleb. - Probing Security through Input-Output Separation and Revisited Quasilinear Masking - IACR TCHES
Joint work with Dahmun Goudarzi, Thomas Prest and Damien Vergnaud.
2020
- Random Probing Security: Verification, Composition, Expansion and New Constructions - CRYPTO
Joint work with Sonia Belaïd, Jean-Sébastien Coron, Emmanuel Prouff and Abdul Rahman Taleb. - Defeating State-of-the-Art White-Box Countermeasures with Advanced Gray-Box Attacks - IACR TCHES
Joint work with Louis Goubin and Junwei Wang . - Pyjamask: Block Cipher and Authenticated Encryption with Highly Efficient Masked Implementation - IACR ToSC
Joint work with Dahmun Goudarzi, Jérémy Jean, Stefan Kölbl, Thomas Peyrin, Yu Sasaki and Siang Meng Sim. - Tornado: Automatic Generation of Probing-Secure Masked Bitsliced Implementations - EUROCRYPT
Joint work with Sonia Belaïd, Pierre-Evariste Dagand, Darius Mercadier and Raphaël Wintersdorff. - How to Reveal the Secrets of an Obscure White-Box Implementation - J. of Cryptographic Engineering
Joint work with Louis Goubin, Pascal Paillier and Junwei Wang.
2019
- Analysis and Improvement of Differential Computation Attacks against Internally-Encoded White-Box Implementations - IACR TCHES
Joint work with Junwei Wang. - Higher-Order DCA against Standard Side-Channel Countermeasures - COSADE
Joint work with Andrey Bogdanov, Philip S. Vejre and Junwei Wang.
2018
- How to Securely Compute with Noisy Leakage in Quasilinear Complexity - ASIACRYPT
Joint work with Dahmun Goudarzi and Antoine Joux. - Tight Private Circuits: Achieving Probing Security with the Least Refreshing - ASIACRYPT
Joint work with Sonia Belaïd and Dahmun Goudarzi. - Secure Multiplication for Bitslice Higher-Order Masking: Optimisation and Comparison - COSADE
Joint work with Dahmun Goudarzi, Anthony Journault and François-Xavier Standaert.
2017
- Generalized Polynomial Decomposition for S-boxes with Application to Side-Channel Countermeasures - CHES
Joint work with Dahmun Goudarzi, Damien Vergnaud, and Srinivas Vivek. - How Fast Can Higher-Order Masking Be in Software? - EUROCRYPT
Joint work with Dahmun Goudarzi.
2016
- On the Multiplicative Complexity of Boolean Functions and Bitsliced Higher-Order Masking - CHES
Joint work with Dahmun Goudarzi. - Lattice Attacks against Elliptic-Curve Signatures with Blinded Scalar Multiplication - SAC
Joint work with Dahmun Goudarzi and Damien Vergnaud.
2015
- Algebraic Decomposition for Probing Security - CRYPTO
Joint work with Claude Carlet, Emmanuel Prouff, and Thomas Roche.
2014
- How to Estimate the Success Rate of Higher-Order Side-Channel Attacks - CHES
Joint work with Victor Lomné, Emmanuel Prouff, Thomas Roche, and Adrian Thillard. - On Double Exponentiation for Securing RSA against Fault Analysis - CT-RSA
Joint work with Duc-Phong Le and Chik How Tan. - On the Practical Security of a Leakage Resilient Masking Scheme - CT-RSA
Joint work with Emmanuel Prouff and Thomas Roche.
2013
- Masking against Side Channel Attacks: a Formal Security Proof - EUROCRYPT
Joint work with Emmanuel Prouff. - SCARE of Secret Ciphers with SPN Structures - ASIACRYPT
Joint work with Thomas Roche. - White-Box Security Notions for Symmetric Encryption Schemes - SAC
jont work with Cécile Delerablée, Tancrède Lepoint, and Pascal Paillier. - Two Attacks on a White-Box AES Implementation - SAC
Joint work with Tancrède Lepoint, Yoni De Mulder, Peter Roelse, and Bart Preneel.
extended abstract of this paper merged with another paper - Higher-Order Side Channel Security and Mask Refreshing - FSE
Joint work with Jean-Sébastien Coron, Emmanuel Prouff, and Thomas Roche.
2012
- Higher-Order Masking Schemes for S-boxes - FSE
Joint work with Claude Carlet, Louis Goubin, Emmanuel Prouff, and Michael Quisquater. - Conversion of Security Proofs from One Leakage Model to Another: a New Issue - COSADE
Joint work with Jean-Sébastien Coron, Christophe Giraud, Emmanuel Prouff, Soline Renner, and Praveen Kumar Vadnala. - Differential Fault Analysis of DES
book chapter in Fault Analysis in Cryptography
2011
- Mutual Information Analysis: a Comprehensive Study - J. of Cryptology
Joint work with Lejla Batina, Benedikt Gierlichs, Emmanuel Prouff, François-Xavier Standaert, and Nicolas Veyrat-Charvillon. - Scalar Multiplication on Weierstraß Elliptic Curves from Co-Z Arithmetic - J. of Cryptographic Engineering
Joint work with Raveen R. Goundar, Marc Joye, Atsuko Miyaji, and Alexandre Venelli. - Univariate Side-Channel Attacks and Leakage Modeling - J. of Cryptographic Engineering
Joint work with Julien Doget, Emmanuel Prouff, and François-Xavier Standaert.
Short version presented at COSADE 2011.
2010
- Provably Secure Higher-Order Masking of AES - CHES
Joint work with Emmanuel Prouff. - Affine Masking against Higher-Order Side Channel Analysis - SAC
Joint work with Guillaume Fumaroli, Ange Martinelli, and Emmanuel Prouff. - Theoretical and Practical Aspects of Mutual Information Based Side Channel Analysis (Extended Version) - Int. J. of Applied Cryptography
Joint work with Emmanuel Prouff.
2009
- Statistical Analysis of Second Order Differential Power Analysis - IEEE Transactions on Computers
Joint work with Emmanuel Prouff and Régis Bévan. - Higher-Order Masking and Shuffling for Software Implementations of Block Ciphers - CHES
Joint work with Emmanuel Prouff and Julien Doget. - Differential Fault Analysis on DES Middle Rounds - CHES
- Securing RSA against Fault Analysis by Double Addition Chain Exponentiation - CT-RSA
- Theoretical and Practical Aspects of Mutual Information Based Side Channel Analysis - ACNS
Joint work with Emmanuel Prouff. - On Second-Order Fault Analysis Resistance for CRT-RSA Implementations - WISTP
Joint work with Emmanuelle Dottax, Christophe Giraud, and Yannick Sierra.
Best paper award.
2008
- Attack and Improvement of a Secure S-Box Calculation Based on the Fourier Transform - CHES
Joint work with Jean-Sébastien Coron, Christophe Giraud, and Emmanuel Prouff.
Best paper award. - Block Ciphers Implementations Provably Secure Against Second Order Side Channel Analysis - FSE
Joint work with Emmanuelle Dottax and Emmanuel Prouff. - On the Exact Success Rate of Side Channel Analysis in the Gaussian Model - SAC
2007
- Side Channel Cryptanalysis of a Higher Order Masking Scheme - CHES
Joint work with Jean-Sébastien Coron and Emmanuel Prouff.
Best paper award. - A Generic Method for Secure SBox Implementation - WISA
Joint work with Emmanuel Prouff.
Thesis
- On the Provable Security of Cryptographic Implementations
Habilitation thesis.
Defended on June 21, 2022 at École Normale Supérieure (Paris).
- On the Physical Security of Cryptographic Implementations
PhD thesis.
Defended on September 22, 2009 at University of Luxembourg.
Unpublished manuscripts
- MIRA: a Digital Signature Scheme based on the MinRank problem and the MPC-in-the-Head paradigm - 2023
Joint work with Nicolas Aragon, Loïc Bidoux, Jesús-Javier Chi-Domínguez, Thibauld Feneuil, Philippe Gaborit and Romaric Neveu. - Trap Me If You Can - Million Dollar Curve - 2015
Joint work with Thomas Baignères, Cécile Delerablée, Matthieu Finiasz, Louis Goubin and Tancrède Lepoint. - Another Nail in the Coffin of White-Box AES Implementations - 2013
Joint work with Tancrède Lepoint. - Fast and Regular Algorithms for Scalar Multiplication over Elliptic Curves - 2011
Scientific Activities
Advising
I have been — or currently am — the PhD co-supervisor of:
- Victor Normand (2024-present) Generation of Masking Countermeasures Against Side-Channel Attacks
Co-supervision with Sonia Belaïd and Phong Nguyen. - Nicolas Bon (2022-present) Development of Optimized Operations for Homomorphic Cryptography
Co-supervision with Sonia Belaïd and David Pointcheval. - Abdul Rahman Taleb (2020-2023) Secure and Verified Cryptographic Implementations in the Random Probing Model
Co-supervision with Sonia Belaïd and Damien Vergnaud. - Thibauld Feneuil (2020-2023) Post-Quantum Signatures from Secure Multiparty Computation
Co-supervision with Jean-Claude Bajard and Antoine Joux. - Junwei Wang (2017-2020) On the Practical Security of White-Box Cryptography
Co-supervision with Jean-Sébastien Coron, Sihem Mesnager and Pascal Paillier. - Dahmun Goudarzi (2015-2018) Secure Implementation of Block Ciphers against Physical Attacks
Co-supervision with Damien Vergnaud.
Chairing
I acted as:
- Program co-chair of CASCADE 2025
- Area chair for EUROCRYPT 2025
- Program co-chair of CHES 2018 (co-editor-in-chief of IACR TCHES Vol. 2018)
Editing
I am co-editor of the three-volume book Embedded Cryptography of the collection SCIENCES co-published by ISTE and Wiley. Links to: Volume 1, Volume 2, Volume 3.
Reviewing
I served — or am currently serving — as a program committee member for: SAC 2025 EUROCRYPT 2025 SAC 2024 CRYPTO 2024 EUROCRYPT 2024 SAC 2023 CRYPTO 2023 CHES 2022 LATINCRYPT 2021 EUROCRYPT 2021 JC2 2020 CHES 2019 ASIACRYPT 2017 CHES 2017 COSADE 2017 TIs 2016 SPACE 2016 CHES 2016 EUROCRYPT 2016 COSADE 2016 GREHACK 2015 CHES 2015 COSADE 2015 CHES 2014 FDTC 2014 COSADE 2014 CARDIS 2013 CHES 2013 FDTC 2013 COSADE 2013 CARDIS 2012 CHES 2012 FDTC 2012 HOST 2012 CARDIS 2011 HOST 2011 HOST 2010
Organizing
I have co-organized:
- The WhibOx contest, edition 1 (2017), edition 2 (2019), edition 3 (2021) and edition 4 (2024).
- Several ECRYPT-CSA workshops: WISE 2015, AWACS 2016, WhibOx 2016, wr0ng 2017.
- The conference CHES 2015 – French press about the event: Les rois du cryptage à Saint-Malo.
PhD committees
I served as a PhD committee member for: Agathe Houzelot (Oct. 2024), Pierre Galissant (Dec. 2023), Samuel Tap (Dec. 2023), Léonard Assouline (Dec. 2023), Chloé Gravouil (Jun. 2023), Valence Cristiani (Dec. 2022), Melissa Azouaoui (Oct. 2021), Aleksei Udovenko (Apr. 2019), Romain Poussier (Jan. 2018).
Membership
Talks
- Constructions for digital signatures - Part III: Threshold Computation in the Head
Invited talk at NIST PQC Seminar, 2 July 2024 (remote seminar) -
Zero-Knowledge Proofs & Post-Quantum Signatures from MPC in the Head
Day 1: Introduction to Zero-Knowledge Proofs and the MPC-in-the-Head Paradigm
Day 2: Post-Quantum Signatures from MPC in the Head
Invited lecture at PQ-TLS Summer school 2024, 18 & 19 June 2024, Anglet (France) - Threshold Computation in the Head
Invited talk at New Trends in Post-Quantum Cryptography (newtpqc) workshop, 11 June 2024, Oxford - Post-Quantum Signatures from Threshold Computation in the Head
5th NIST PQC Conference, 11 April 2024, Washington DC - High Order Side-Channel Security for Elliptic-Curve Implementations
CHES 2023, 13 September 2023, Prague - MQOM & SD in the Head Signature Schemes
Invited talk at Oxford Post-Quantum Cryptography Summit 2023, 4 September 2023, Oxford - Zero-Knowledge Proofs from Multiparty Computation: Recent Advances
Invited talk at WRACH 2023, 14 June 2023, Roscoff - Tutorial on White-Box Cryptography ( lab)
Tutorial at CHES 2022, co-hosted with Aleksei Udovenko, 18 September 2022, Leuven - A Quest for Provable Security against Side-Channel Attacks
Keynote talk at Africacrypt, 19 July 2022, Fes (Morocco) - A Quest for Provable Security against Side-Channel Attacks
Keynote talk at Cyber in Nancy, 7 July 2022, LORIA, Nancy (France) - On the Provable Security of Cryptographic Implementations
Habilitation defense, 21 June 2022, ENS Paris - Probing Security through Input-Output Separation and Revisited Quasilinear Masking
CHES 2021 (virtual event), 13 September 2021 - Securing Cryptographic Modules: A Shades of Gray Story -
Keynote talk at ICMC19, 16 May 2019, Vancouver - Secure Computation in the Presence of Noisy Leakage
Invited talk at Journées C2, 10 October 2018, Aussois (France) - White-Box Cryptography
Invited talk at CARDIS 2017, 14 November 2017, Lugano - White-Box Cryptography
Invited talk at Journées Nationales 2017 Pré-GDR Sécurité Informatique, 31 May 2017, Paris - White-Box Cryptography
Keynote talk at PHISIC 2016, École des Mines de Saint-Étienne, Provence - From Obfuscation to White-Box Crypto: Relaxation and Security Notions
WhibOx 2016, 14 August 2016, Santa Barbara - Lattice Attacks against Elliptic-Curve Signatures with Blinded Scalar Multiplication
SAC 2016, 12 August 2016, St John's (Newfoundland, Canada) - Provable Security against Side-Channel Attacks
MCrypt Seminar, 11 August 2014, Les Deux Alpes (France) - SCARE of Secret Ciphers with SPN Structures
ASIACRYPT 2013, 3 December 2013, Bangalore - Masking against Side-Channel Attacks: a Formal Security Proof
EUROCRYPT 2013, 27 May 2013, Athens - Higher-Order Masking Schemes for S-boxes
FSE 2012, 21st March 2012, Washington DC - Provably Secure Higher-Order Masking of AES
CHES 2010, 20 August 2010, Santa Barbara - On the Physical Security of Cryptographic Implementations
PhD defense, 22 September 2009, University of Luxembourg - Securing RSA against Fault Analysis by Double Addition Chain Exponentiation
CT-RSA 2009, 24 April 2009, San Francisco - Attack and Improvement of a Secure S-box Calculation Based on the Fourier Transform
CHES 2008, 11 August 2008, Washington DC - Block Ciphers Implementations Provably Secure Against Second Order Side Channel Analysis
FSE 2008, 11 February, Lausane - Side Channel Cryptanalysis of a Higher Order Masking Scheme
CHES 2007, 11 September 2007, Vienna
Standardization
I am a co-submitter of the following post-quantum signature candidates to NIST's Call for Additional Digital Signature Schemes, all based on the MPC-in-the-Head paradigm:
- MQOM ("MQ on my Mind") based on the hardness of the MQ problem
- SDitH ("Syndrome Decoding in the Head") based on the hardness of the Syndrome Decoding problem
- RYDE based on the hardness of the Rank Syndrome Decoding problem
- Mirath based on the hardness of the MinRank problem
- PERK based on the hardness of the Permuted Kernel problem
I was a co-submitter of Pyjamask, a masking-friendly cipher submitted to NIST call for Lightweight Cryptography.