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Serge Fehr   Cryptology Group 


Serge received his M.Sc. in mathematics in March 1998 from the Swiss Federal Institute of Technology (ETH) Zürich. The following years, he spent as a Ph.D. student in the cryptography research group of Ueli Maurer at ETH Zürich and in the cryptology group of Ivan Damgård at BRICS, University of Aarhus (Denmark). He received his Ph.D. in computer science in 2003 from the University of Aarhus under the supervision of Ivan Damgård and Ronald Cramer. He then worked as a Postdoc Research Fellow under Igor Shparlinski at Macquarie University in Sydney (Australia). In August 2004, Serge joined Ronald Cramer's Cryptology Group at CWI in Amsterdam (The Netherlands), where he is now a senior researcher. Since 2018, Serge is also a professor at the Mathematical Institute, Leiden University.

Research Interest

Serge's primary field of interest is the mathematics of information security and cryptology, covering theoretical foundations as well as practical aspects. One main motivation is bringing theory and practice closer together by developing efficient systems whose security lies on firm theoretical ground. For example, one area of central interest is the feasibility of obtaining secure protocols in a partly dishonest multi-player environment, as well as their algebraic and number theoretic aspects. Some key-words in this context are (verifiable) secret sharing, threshold cryptography, and multi-party computation. Another area of interest is information-theoretic cryptography and quantum cryptography, i.e., the study of unconditionally-secure implementations of various cryptographic tasks, based on physical assumptions like a noisy channel or a quantum channel, again with a focus on practical yet provably-secure solutions. Furthermore, Serge is interested in and working on various other topics, like public-key encryption and zero-knowledge proofs. You are welcome to browse his list of publications.