About

I am a fourth-year PhD student in the Laboratory for Data Security advised by Prof. Jean-Pierre Hubaux at the Ecole Polytechnique Fédérale de Lausanne. 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 on privacy. I earned a MSc in Computer Engineering with a specialization in Security from Georgia Tech in 2017. I also hold a MSc and BSc in Engineering from CentraleSupelec.

Interests
  • Security and Privacy
  • Applied Cryptography
  • Homomorphic Encryption
  • Zero-knowledge Proofs
Education

  • Ph.D. in Computer Science, 2018 - now

    Ecole Polytechnique Federale de Lausanne, EPFL

  • MSc in Electrical and Computer Engineering, 2016-2017

    Georgia Institute of Technology

  • MSc and BSc in Engineering, 2014-2018

    CentraleSupelec - Supelec

Publications

Sylvain Chatel, Christian Knabenhans, Apostolos Pyrgelis, and Jean-Pierre Hubaux (2022). Verifiable Encodings for Secure Homomorphic Analytics. arXiv.

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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.

PDF Cite Code Project Poster Slides Video

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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Carmela Troncoso, Mathias Payer, Jean-Pierre Hubaux, Sylvain Chatel, et al (2020). Decentralized Privacy-Preserving Proximity Tracing. In arXiv preprint.

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Sylvain Chatel*, Arnout Devos*, Matthias Grossglauser, *Equal contribution (2019). Reproducing Meta-learning with differentiable closed-form solvers. In RML@ ICLR 2019 and ReScience journal C, 2019.

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Experience

 
 
 
 
 
Teaching Assistant (Ph.D. program)
Swiss Federal Institute of Technology in Lausanne (EPFL)
Jan 2019 – Present Lausanne, Switzerland
  • COM402 - Security and Privacy (2018-2022)
  • CS523 - Advanced Topics in Privacy (2019)
  • COM405 - Mobile Networks (2021-2022)

Received a Teaching award in 2021

 
 
 
 
 
Cybersecurity Consultant
Darktrace
Feb 2018 – Aug 2018 Paris, France
Key responsibilities include providing technical and cyber defense expertise, conducting cyber threat analysis, architecting deployments, and animate customer facing (pre/post-sales).
 
 
 
 
 
Research Intern
Airbus Defence and Space (Space Systems, Inc.) – Telecom Advanced Payload Team
Jan 2017 – Jul 2017 Toulouse, France
Research on the optimisation, modelling, and data analysis of satellite telecommunicaiton payloads with active antennas. Supervised by Andrew Thain.
 
 
 
 
 
Research Intern
Automatic Control team of IETR
Jun 2016 – Jul 2016 Rennes, France
Security of the Distributed Model Predictive Control (MPC). Preliminary security analysis of the distributed model predictive control (DMPC) model. Supervised by Pierre Haessig and Romain Bourdais.

Projects

VERITAS Project
Verifying FHE computations against covert clouds
CRISP Project
Verifying correct FHE outsourcing against covert clients
Collaborative Tree-based Model Learning
Overview of the security and privacy of distributed learning of tree-based models

Contact