Baptiste Lambin
Contact
Cryptolux
Université du Luxembourg
Office : MNO, E02 0245-110
Maison du Nombre
6, Avenue de la Fonte
L-4364 Esch-sur-Alzette, Luxembourg
E-mail : baptiste [dot] lambin [at] protonmail [dot] com
About me
I'm currently a post-doc under the supervision of Alex Biryukov in the Univeristy of Luxembourg since April 2022.
I obtained my PhD on the October, 22nd 2019, under the supervision of Pierre-Alain Fouque and Patrick Derbez. This was followed by a post-doc at Ruhr-University Bochum under the supervision of Gregor Leander up until I moved to my current position in Luxembourg.
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.
Publications
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Patrick Derbez, Baptiste Lambin
Fast MILP Models for Division Property
To be published at ToSC 2022-2, Conference FSE 2022
Implementation available here
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Phil Hebborn, Baptiste Lambin, Gregor Leander, Yosuke Todo
Strong and Tight Security Guarantees against Integral Distinguishers
ASIACRYPT 2021
Implementation available here
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Dušan Božilov, Maria Eichlseder, Miroslav Knežević, Baptiste Lambin, Gregor Leander, Thorben Moos, Ventzislav Nikov, Shahram Rasoolzadeh, Yosuke Todo, Friedrich Wiemer
PRINCEv2: More Security for (Almost) No Overhead
SAC 2020
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Phil Hebborn, Baptiste Lambin, Gregor Leander, Yosuke Todo
Lower Bounds on the Degree of Block Ciphers
ASIACRYPT 2020
Implementation available here
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Patrick Derbez, Pierre-Alain Fouque, Baptiste Lambin
Linearly equivalent S-boxes and the Division Property
DCC 2020
Implementation available here
- Patrick Derbez, Pierre-Alain Fouque, Baptiste Lambin and Victor Mollimard
Efficient Search for Optimal Diffusion Layers of Generalized Feistel Networks
ToSC 2019-2, Conference FSE 2020
- Patrick Derbez, Pierre-Alain Fouque, Jérémy Jean and Baptiste Lambin
Variants of the AES Key Schedule for Better Truncated Differential Bounds
SAC 2018
Implementation available here.
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Patrick Derbez, Pierre-Alain Fouque, Baptiste Lambin and Brice Minaud
On Recovering Affine Encodings in White-Box Implementations
CHES 2018 (Online video)
Implementation available here
Talks
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Strong and Tight Security Guarantees Against Integral Distinguishers, presented :
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Lower Bounds on the Degree of Block Ciphers, presented :
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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)
Teaching
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).
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INF1 : Introduction to imperative programming based on the Java language for first year students.
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OIA : Follow-up course of INF1 for maths students. Introduction to complexity, sorting algorithms,...
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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,...)
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SECU : Fourth year course. Introduction to cryptography, HTML/PHP vulnerabilities, openssl, PGP etc.
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APS : Follow-up course of SECU. Emphasis on cryptanalysis (CSS, correlation attacks, padding oracle attacks, etc.)