My research focuses on Fully Homomorphic Encryption (FHE) and other Privacy-Enhancing Technologies (PET). I hold a PhD in Computer Science from CEA & IMT Atlantique where I specialized in practical applications of Functional Encryption (FE). I also earned a Master’s degree in Mathematics and Computer Science applied to Cryptology from Université Paris Diderot-Paris 7.
I am currently working as a researcher at DESILO in Seoul, where I pursue my research journey in the FHE world. My work also extends to FHE standardization efforts within ISO SC27/WG2. I have more than 6 years of experience in the industry where I had the chance to do research, implement cryptographic primitives, manage engineers and researchers, facilitate the communication between developers and cryptographers and produce internal popularization content for learning about FHE. During my time at Zama, I notably built the foundations of CONCRETE and TFHE-rs.
📞 Contact
📃 Publications
2025
- TFHE Gets Real: an Efficient and Flexible Homomorphic Floating-Point Arithmetic, L. Bergerat, I. Chillotti, D. Ligier, J.-B. Orfila & S. Tap, TCHES 2025, paper.
2024
- Faster Secret Keys for (T)FHE or New Secret Keys for Enhanced Performance in (T)FHE, L. Bergerat, I. Chillotti, D. Ligier, J.-B. Orfila, A. Roux-Langlois & S. Tap, Modified version to appear at CCS 2024, paper.
- TFHE Simplified: A Practical Guide to Integer Arithmetic and Reliability, I. Chillotti, S. El Kazdadi, D. Ligier, A. Meyre, T. Montaigu, J.-B. Orfila & S. Tap, Accepted talk at FHE.org 2024.
2023
- Parameter Optimization & Larger Precision for (T)FHE, L. Bergerat, A. Boudi, Q. Bourgerie, I. Chillotti, D. Ligier, J.-B. Orfila & S. Tap, Journal of Cryptology 2023 & accepted talk at FHE.org 2023, paper.
2021
- Improved Programmable Bootstrapping with Larger Precision and Efficient Arithmetic Circuits for TFHE, I. Chillotti, D. Ligier, J.-B. Orfila & S. Tap, Asiacrypt 2021, paper.
- Cloud-based Private Querying of Databases by Means of Homomorphic Encryption, Y. Abbar, P. Aubry, T. Barry, S. Carpov, S. Mallick, M. Krichen, D. Ligier, S. Shpak & R. Sirdey, IoTBDS 2021.
2020
- CONCRETE: Concrete Operates oN Ciphertexts Rapidly by Extending TfhE, I. Chillotti, M. Joye, D. Ligier, J.-B. Orfila & S. Tap, Demo paper at WAHC 2020, paper.
- Illuminating the Dark or how to recover what should not be seen in FE-based classifiers, S. Carpov, C. Fontaine, D. Ligier & R. Sirdey, PoPETs 2020.
2017
- Privacy Preserving Data Classification using Inner-product Functional Encryption, S. Carpov, C. Fontaine, D. Ligier & R. Sirdey, ICISSP 2017.
- Information Leakage Analysis of Inner-Product Functional Encryption based Data Classification, S. Carpov, C. Fontaine, D. Ligier & R. Sirdey, PST 2017.
🎤 Recent Talks
- FHE in 2026: Possibilities, Limits, and Recent Directions, June 2026 at the Workshop on Fully Homomorphic Encryption, Institute of Information Engineering CAS (Beijing, China) with I. Chillotti.
- Fully Homomorphic Encryption - ML Applications and New Directions, July 2024 at _PET Meetup (Seoul, Korea) with I. Chillotti.
- Faster Secret Keys for (T)FHE, July 2024 at Normandie 2024 (Caen, France).
- An Overview of FHE, TFHE and Concrete Framework, September 2023 at Cryptography and Coding Theory (Perugia, Italy) with I. Chillotti.
- Parameter Optimization & Larger Precision for (T)FHE, June 2023 at Journées Nationales 2023 du GDR Sécurité Informatique (Campus Cyber, Paris, France) with I. Chillotti.
- Parameter Optimization and Larger Precision for (T)FHE, March 2023 at FHE.org 2023 (Tokyo, Japan) with S. Tap.
- Parameter Optimization & Larger Precision for (T)FHE, March 2023 at the 6th HomomorphicEncryption.org Standards Meeting (Seoul, South Korea) with I. Chillotti.
- An overview of the Concrete Framework, September 2022 at the 5th HomomorphicEncryption.org Standards Meeting (Geneva, Switzerland) with I. Chillotti.
- Improved Programmable Bootstrapping with Larger Precision and Efficient Arithmetic Circuits for TFHE, December 2021 at Asiacrypt 2021 with I. Chillotti, J.-B. Orfila & S. Tap.
🖇️ Program Committees
- FHE.org 2027, April 4, Seattle, USA, link.
- SAC 2026, March 23-27, Thessaloniki, Greece, link.
- PKC 2026, May 25-28, West Palm Beach, USA, link.
🎟️ Organization Committees
- 9th HomomorphicEncryption.org Standards Meeting, March 5 and 6, 2026, Seoul (South Korea), link.
- FHE.org 2024, March 24, 2024, Toronto (Canada), link.
💻 Contribution to (Open-Source) Projects
- DESILO FHE, homomorphic encryption library built on C++ & CUDA and optimized for both CPUs and NVIDIA GPUs.
- CONCRETE, open-source FHE Compiler leveraging LLVM.
- TFHE-rs, Rust implementation of CGGI for boolean and integer arithmetics.
- DataPeps, end-to-end encryption platform.
📝 Blogposts
- FHE Standardization: The Enterprise Guide to ISO and NIST, February 2026, with I. Chillotti & H. Park, link.
- Parameter Optimization & Larger Precision for (T)FHE, June 2023, with L. Bergerat, A. Boudi, I. Chillotti, Q. Bourgerie, J.-B. Orfila & S. Tap, link.
- What’s New in Concrete, September 2021, with B. Curtis, I. Chillotti & A. Péré, link.
🎓 PhD Students
- L. Bergerat, Intern (2021) and PhD Student (2022 to 2023), with I. Chillotti & J.-B. Orfila.
- A. Boudi, PhD student (2022 to 2023), with I. Chillotti & J.-B. Orfila.
📚 Teaching
- 2015 to 2018, Teaching Assistant at Université Paris Sud (Orsay, France), lab sessions (Web Design, Database, JAVA, C++, UML, Supervision of student projects).