Description
De nos jours, la requête «crypto» dans un moteur de recherche renvoie
aux cryptomonnaies. Mais «crypto means crypto», et on peut se poser la
question des liens pertinents entre les deux domaines.
D'un coté, le monde des cryptomonnaies et de la technologie
sous-jacente s'est développé et évolue encore en dehors du monde
académique. Il faut suivre d'un coté des posts de blog, des fils de
discussion X/twitter, voire même des canaux Telegram Etc.
De l'autre coté, dans le monde académique, il y a une
explosion de publications dans les conférences majeures sur le
«zero-knowledge», les «SNARKs», les «STARKS», «SNARGS», «SNORKS».
Bien que le mot blockchain est rapidement mentionné dans ces
publications, en réalité, les industriels des blockchains sont très
demandeurs de ces système de preuves, et les financements abondent.
Dans cet exposé, on dira sommairement comme fonctionne une
blockchain (ouverte, à base de preuve de travail), pour ensuite montrer
comment les systèmes de preuve ou le calcul vérifiable
sont en réalité au cœur des intérêts industriels du domaine.
Practical infos
Next sessions
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Combining Partial Sums and FFT for the Fastest Known Attack on 6‑Round AES
Speaker : Shibam Ghosh - Inria
The partial-sums technique introduced by Ferguson et al. (2000) achieved a 6‑round AES attack with time complexity 2^{52} S‑box evaluations, a benchmark that has stood since. In 2014, Todo and Aoki proposed a comparable approach based on the Fast Fourier Transform (FFT). In this talk, I will show how to combine partial sums with FFT to get "the best of both worlds". The resulting attack on 6[…]-
Cryptography
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Lie algebras and the security of cryptosystems based on classical varieties in disguise
Speaker : Mingjie Chen - KU Leuven
In 2006, de Graaf et al. proposed a strategy based on Lie algebras for finding a linear transformation in the projective linear group that connects two linearly equivalent projective varieties defined over the rational numbers. Their method succeeds for several families of “classical” varieties, such as Veronese varieties, which are known to have large automorphism groups. In this talk, we[…]-
Cryptography
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Some applications of linear programming to Dilithium
Speaker : Paco AZEVEDO OLIVEIRA - Thales & UVSQ
Dilithium is a signature algorithm, considered post-quantum, and recently standardized under the name ML-DSA by NIST. Due to its security and performance, it is recommended in most use cases. During this presentation, I will outline the main ideas behind two studies, conducted in collaboration with Andersson Calle-Vierra, Benoît Cogliati, and Louis Goubin, which provide a better understanding of[…] -
Wagner’s Algorithm Provably Runs in Subexponential Time for SIS^∞
Speaker : Johanna Loyer - Inria Saclay
At CRYPTO 2015, Kirchner and Fouque claimed that a carefully tuned variant of the Blum-Kalai-Wasserman (BKW) algorithm (JACM 2003) should solve the Learning with Errors problem (LWE) in slightly subexponential time for modulus q = poly(n) and narrow error distribution, when given enough LWE samples. Taking a modular view, one may regard BKW as a combination of Wagner’s algorithm (CRYPTO 2002), run[…]-
Cryptography
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CryptoVerif: a computationally-sound security protocol verifier
Speaker : Bruno Blanchet - Inria
CryptoVerif is a security protocol verifier sound in the computational model of cryptography. It produces proofs by sequences of games, like those done manually by cryptographers. It has an automatic proof strategy and can also be guided by the user. It provides a generic method for specifying security assumptions on many cryptographic primitives, and can prove secrecy, authentication, and[…]-
Cryptography
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Structured-Seed Local Pseudorandom Generators and their Applications
Speaker : Nikolas Melissaris - IRIF
We introduce structured‑seed local pseudorandom generators (SSL-PRGs), pseudorandom generators whose seed is drawn from an efficiently sampleable, structured distribution rather than uniformly. This seemingly modest relaxation turns out to capture many known applications of local PRGs, yet it can be realized from a broader family of hardness assumptions. Our main technical contribution is a[…]-
Cryptography
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