Sylvain Chatel

Privacy and Applied Cryptography Researcher

CISPA Helmholtz Center for Information Security

About

I am a privacy and applied cryptography researcher. I am currently a postdoctoral researcher at CISPA working with Dr. Wouter Lueks. Before that, I was member of the Security and Privacy Engineering Laboratory (SPRING) at the Ecole Polytechnique Fédérale de Lausanne (EPFL) in Switzerland.

I completed my PhD at EPFL where I work under the supervision of Prof. Carmela Troncoso and Prof. Jean-Pierre Hubaux.

My research interests revolve around the topic of applied cryptography for security and privacy. In particular, how to combine zero-knowledge proofs and homomorphic encryption to enable security without compromising privacy and utility.

Interests

Security and Privacy
Applied Cryptography
Homomorphic Encryption
Zero-knowledge Proofs

Education

Ph.D. in Computer Science

Ecole Polytechnique Federale de Lausanne, EPFL
MSc in Electrical and Computer Engineering

Georgia Institute of Technology
MSc and BSc in Engineering

CentraleSupelec - Supelec

Publications

Sylvain Chatel, Christian Knabenhans, Apostolos Pyrgelis, Carmela Troncoso, and Jean-Pierre Hubaux (2024). VERITAS: Plaintext Encoders for Practical Verifiable Homomorphic Encryption. CCS 2024.

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Christian Mouchet, Sylvain Chatel, Apostolos Pyrgelis, Carmela Troncoso (2024). Helium: Scalable MPC among Lightweight Participants and under Churn. CCS 2024.

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Sylvain Chatel, Christian Mouchet, Ali Utkan Sahin, Apostolos Pyrgelis, Carmela Troncoso, and Jean-Pierre Hubaux (2023). PELTA -- Shielding Multiparty-FHE against Malicious Adversaries. CCS 2023.

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Sylvain Chatel, Apostolos Pyrgelis, Juan Troncoso-Pastoriza, and Jean-Pierre Hubaux (2021). Privacy and Integrity Preserving Computations with CRISP. In the 30th USENIX Security Symposium, 2021.

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Sylvain Chatel, Apostolos Pyrgelis, Juan Troncoso-Pastoriza, and Jean-Pierre Hubaux (2021). SoK: Privacy-Preserving Collaborative Tree-based Model Learning. In Proceedings on Privacy Enhancing Technologies, Vol. 2021, No. 3, April 2021.

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