Augustin Bariant

Ph.D student in symmetric cryptography at INRIA de Paris

WHO AM I

Former student in Ecole Polytechnique, I completed a double degree with KTH Royal Institute of Technology in Stockholm in 2021. In march 2021, I started a Ph.D in symmetric cryptography in the team COSMIQ of Inria de Paris, under the supervision of Gaëtan Leurent. I am currently working on the cryptanalysis of lightweight symmetric cryptography primitives, especially on candidates of the NIST lightweight comptetition. I am a big fan of boomerang attacks, which I spent a lot of time understanding and studying. I am also interested in classical attacks on SPN ciphers, such as impossible differential, meet-in-the-middle, square or differential-linear attacks, as well as algebraic attacks on arithmetization-oriented ciphers. You can find my (outdated) resumé in french here.

Teaching

2017-2018

• Tutor in mathematics for first-year students (MPSI) in the preparatory school Lycée Louis Le Grand.

2021-2022

• Teaching assistant (TP) for the first year class LU1IN011 at Sorbonne Université (SU): Introduction to Programming in Python.
• Teaching assistant (TP) for the second year class LU2IN019 at SU: Functional Programming.
• Teaching assistant (TD+TP) for the third year class LU3IN024 at SU: Introduction to Cryptology.
• Teaching assistant (TD+TP) for the third year class LU2IN017 at SU: Web Technologies.

2022-2023

• Teaching assistant (TP) for the first year class LU1IN011 at SU: Introduction to Programming in Python.
• Teaching assistant (TP) for the second year class LU2IN019 at SU: Functional Programming.

Talks

• Fast Software Encryption (FSE), 2020: Cryptanalysis of Forkciphers (first part).
• Journées C2, 2022: Generating Bitslice Implementations of Arbitrary S-Boxes.
• Junior Seminar, 2022: Algebraic Attacks against Some Arithmetization-Oriented Hash Functions.

Publications

1.	A. Bariant, N. David, G. Leurent, Cryptanalysis of Forkciphers, IACR Transactions on Symmetric Cryptology, 2020 (volume 1).
2.	A. Bariant, C. Bouvier, G. Leurent, L. Perrin, Algebraic Attacks against Some Arithmetization-Oriented Primitives, IACR Transactions on Symmetric Cryptology, 2022 (volume 3).
3.	A. Bariant, G. Leurent, Truncated Boomerang Attacks and Application to AES-based Ciphers, eprint version.