Workgroup for Symmetric Cryptography
Horst Görtz Institute for IT-Security
Visiting address: Wasserstraße 221, 44801 Bochum
E-mail : baptiste [dot] lambin [at] protonmail [dot] com
I'm currently a post-doc under the supervision of Gregor Leander .
I obtained my PhD on the October, 22nd 2019, under the supervision of Pierre-Alain Fouque and Patrick Derbez.
My topic of research is symmetric cryptography, especially Division Property, Differential Attacks, Boomerang and others.
I'm also interested in constraint programming tools (CP, MILP, etc.) and their applications to symmetric cryptography.
On Recovering Affine Encodings in White-Box Implementations, presented :
- at the CHES 2018 conference in Amsterdam, Netherlands
- at the Séminaire C2 at the LIP6 lab in Paris, France
- Variants of the AES Key Schedule for Better Truncated Differential Bounds, presented :
- Efficient Search for Optimal Diffusion Layers of Generalized Feistel Networks, presented :
- Making (near) Optimal Choices for the Design of Block Ciphers, a merged presentation of my SAC'18 and FSE'20 papers, presented :
- Linearly equivalent S-boxes and the Division Property, presented :
- Attaque sur une implémentation en boîte blanche d’AES
Presentation at the Journées Codage & Cryptographie 2017 workshop about a part of my CHES 2018 paper, in La Bresse, France
- Ma thèse en 180 secondes (video in French)
Presentation of my PhD in 3 minutes, targeted for general audience (the public was mainly composed of high schoolers)
All of these courses were done at Université de Rennes 1.
For most of them, I was in charge of some exercise courses (TD), practical courses (TP), as well as writing some of the exercise sheets for some (especially INF1).
INF1 : Introduction to imperative programming based on the Java language for first year students.
OIA : Follow-up course of INF1 for maths students. Introduction to complexity, sorting algorithms,...
BCS : Fifth year course for non-crypto students. Basic implementation of some cryptographic primitives and attacks in C (CSS, MD4, AES) and Python (RSA), as well as some tools for cryptography (writing a big number library in C, using openssl,...)
SECU : Fourth year course. Introduction to cryptography, HTML/PHP vulnerabilities, openssl, PGP etc.
APS : Follow-up course of SECU. Emphasis on cryptanalysis (CSS, correlation attacks, padding oracle attacks, etc.)