Antonin LEROUX

I am a part-time researcher in the team of Effective Algebraic Geometry at IRMAR, Université de Rennes. Before that, I was a PhD student in the team GRACE at Ecole Polytechnique and INRIA Saclay under the supervision of Luca de Feo and Benjamin Smith.

I focus my research on isogeny-based cryptography. My main interest is on Quaternion Algebras and their impact on isogenies through the Deuring correspondence. This equivalence of categories between geometric objects that are elliptic curves and algebraic quaternion have showed to be a powerful tool to analyze the security of isogeny-based scheme. It has also some constructive applications such as signature. SQIsign, the main construction we obtained with this techniques was recently submitted to the NIST PQC competition new call for signatures. All the information on the submission are available here.

More generally, I am interested in everything related to isogeny-based cryptography and the algorithmic challenges it raises. I have also done some work on improving the efficiency of isogenies' evaluation, check it out at
I am interested in cryptography in general and also done some work in Multiparty Computation.

The manuscript of my thesis is available here.




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