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Guilhem Niot

PhD Student, Major Cybersecurity and Cryptography
PQShield, University of Rennes
guilhem (at) gniot.fr


About me Publications Awards Talks Projects Blog

About Me

I am a PhD student at PQShield supervised by Thomas Prest (PQShield) and Pierre-Alain Fouque (Université de Rennes 1). I recently graduated from ENS Lyon, France and EPFL, Switzerland, and obtained a double Master of Computer Science. I am majoring in Cybersecurity and Cryptography and I’m very much interested into all topics related to privacy, applied cryptography and software security, ranging from analysing the security of protocols, to writing efficient and secure software, or working on more theorical yet practical cryptographic schemes.

Check my resume to learn more about my background.

Research Interests

Preprints

  1. Lattice-based Threshold Blind Signatures
    Sebastian Faller, Guilhem Niot, Michael Reichle
  2. Threshold Signatures Reloaded: ML-DSA and Enhanced Raccoon with Identifiable Aborts
    Giacomo Borin, Sofia Celi, Rafael del Pino, Thomas Espitau, Guilhem Niot, Thomas Prest
  3. Simple and Efficient Lattice Threshold Signatures with Identifiable Aborts
    Rafael del Pino, Thomas Espitau, Guilhem Niot, Thomas Prest

Publications

2026

  1. Efficient Threshold ML-DSA
    Sofia Celi, Rafael del Pino, Thomas Espitau, Guilhem Niot, Thomas Prest
    USENIX Security 2026
  2. Adaptively-Secure Three-Round Threshold Schnorr from DL
    Guilhem Niot, Michael Reichle, Kaoru Takemure
    EUROCRYPT 2026
  3. Revisiting PQ WireGuard: A Comprehensive Security Analysis With a New Design Using Reinforced KEMs
    Keitaro Hashimoto, Shuichi Katsumata, Guilhem Niot, Thom Wiggers
    S&P 2026

2025

  1. Subversion-resilient Key-exchange in the Post-quantum World
    Kévin Duverger, Pierre-Alain Fouque, Charlie Jacomme, Guilhem Niot, Cristina Onete
    ACM CCS 2025
  2. Unmasking TRaccoon: A Lattice-Based Threshold Signature with An Efficient Identifiable Abort Protocol
    Rafael del Pino, Shuichi Katsumata, Guilhem Niot, Michael Reichle, Kaoru Takemure
    CRYPTO 2025
  3. Comprehensive Deniability Analysis of Signal Handshake Protocols: X3DH, PQXDH to Fully Post-Quantum with Deniable Ring Signatures
    Shuichi Katsumata, Guilhem Niot, Ida Tucker, Thom Wiggers
    USENIX Security 2025
  4. Practical Deniable Post-Quantum X3DH: A Lightweight Split-KEM for K-Waay
    Guilhem Niot
    ACM ASIACCS 2025
  5. Finally! A Compact Lattice-Based Threshold Signature
    Rafael del Pino, Guilhem Niot
    PKC 2025
  6. Share the MAYO: thresholdizing MAYO
    Sofia Celi, Daniel Escudero, Guilhem Niot
    PQCrypto 2025

2024

  1. Flood and Submerse: Distributed Key Generation and Robust Threshold Signature from Lattices
    Thomas Espitau, Guilhem Niot, Thomas Prest
    CRYPTO 2024
  2. Plover: Masking-Friendly Hash-and-Sign Lattice Signatures
    Muhammed F. Esgin, Thomas Espitau, Guilhem Niot, Thomas Prest, Amin Sakzad, Ron Steinfeld
    EUROCRYPT 2024

2023

  1. Squirrels: An efficient and secure post-quantum signature scheme based on plain lattices
    Thomas Espitau, Guilhem Niot, Chao Sun, Mehdi Tibouchi
    National Institute of Standards and Technology (NIST), Additional Digital Signature Schemes, 2023
    PDF NIST listing Master thesis report

2022

  1. GoldFinger: Fast & Approximate Jaccard for Efficient KNN Graph Constructions
    Rachid Guerraoui, Anne-Marie Kermarrec, Guilhem Niot, Olivier Ruas, François Taïani
    IEEE/Transactions on Knowledge and Data Engineering (TKDE), 2022
    PDF Code 1 Code 2 Code 3 Internship report

Awards

Talks

Signal Handshake Protocols

  • A Comprehensive Study of Signal Handshake Protocols: X3DH, PQXDH to Fully Post-Quantum with Deniable Ring Signatures
    • Berkeley Security Seminar, Remote (03/12/2025) — PDF

Threshold ML-DSA & Signatures

  • Mithril: Efficient Threshold ML-DSA from Short Secret Sharing
    • NIST MPTS Workshop 2026 (28/01/2026) — PDF
    • NIST Sixth PQC Standardization Conference, Remote (25/09/2025) — PDF
    • JP Morgan AlgoCRYPT Seminar, New York (29/08/2025) — PDF
  • Lattice-based Threshold Blind Signatures
    • NIST MPTS Workshop 2026 (28/01/2026) — PDF
  • PQC + Threshold: State of the Art in Threshold Quantum-Resistant Signatures
    • CryptoDay @ Télécom Paris, Paris (18/09/2025) — PDF
  • Finally! A Compact Lattice-Based Threshold Signature
    • Journées C2 ‘25, Pornichet, France (04/2025) — PDF

Secret Sharing & Identifiable Aborts

  • Short Shares, Small Coefficients: A New Secret Sharing Scheme and its Applications to Lattice-based Threshold Cryptography
    • Almasty Seminar, LIP6, Sorbonne University, Paris (21/03/2025) — PDF
    • IBM Research Europe visit, Zurich (03/02/2025) — PDF
    • JP Morgan AlgoCRYPT Seminar, Remote (10/01/2025) — PDF
  • Identifiable Aborts in TRaccoon: Let’s introduce Short Secret Sharings
    • Journée PEPR PQ TLS, Paris (13/03/2025) — PDF
  • Secret Sharing Schemes for Lattice-Based Threshold Cryptography
    • Workshop on secret sharing schemes, satellite EUROCRYPT 2025, Tarragona (14/05/2025) — PDF
  • Beyond the Threshold: Detecting Aborts in Lattice-based Threshold Signature Schemes
    • Visit Cryptography and Privacy Lab, Seoul National University (03/12/2024) — PDF

Flood and Submerse

  • Flood and Submerse: Distributed Key Generation and Robust Threshold Signature from Lattices
    • ENSL/CWI/KCL/IRISA joint crypto seminar, Remote (30/09/2024) — PDF
    • CRYPTO 2024, Santa Barbara (19/08/2024) — PDF

Plover

  • Plover: Masking-Friendly Hash-and-Sign Lattice Signature
    • EUROCRYPT 2024, Zurich (30/05/2024) — PDF
    • CAPSLOCK Seminar, Rennes (05/04/2024) — PDF

Squirrels

  • Squirrels: a post-quantum signature scheme based on plain lattices
    • Journées C2 ‘23 (18/10/2023) — PDF
    • Master thesis defense (12/09/2023) — PDF

Other

  • Making KNN algorithms faster with GoldFinger, a Fast and Precise method for approximating Jaccard similarity
    • Master internship defense (08/2021) — PDF
  • Intel SGX enclaves
    • Bachelor internship defense (French) (08/2020) — PDF

Posters

  • Efficient Threshold ML-DSA
    • ACM CCS 2025 (10/2025) — PDF
  • Squirrels: Unstructured Lattice Digital Signature
    • NIST Fifth PQC Standardization Conference (04/2024) — PDF

Projects

  1. SACCHA: Dog model reproducing heart murmurs for training veterinary students.
    Elise Postic, Guilhem Niot, Alexandre Variengien, Simon Dupouy, Théo Regny
    PDF
  2. Mixed Feelings: Small game developed in 24h during the Orbital Game Jam 2022 at EPFL.
    Yann Aguettaz, Diego Dorn, Anita Dürr, Guilhem Niot, Alexandre Variengien
    Code
  3. NelmioApiDocBundle: Extension of PHP Framework Symfony to ease API documentation.
  4. Dolphin: a toy decentralized bill-sharing app. CRDTs for managing distributed data, and TreeKEM for Group Key Management and key rotations.
  5. Pingo: a π-calculus interpreter in G
  6. Modelling of impact of Covid tracing apps.
  7. Vice-president of AliENS, the IT association of ENS de Lyon (600 members) from 2020 until 2022.

Blog posts

Reviewed for

I also took part in the peer-reviewing process of the following conferences:

and journals: