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  • Cet exposé a été présenté le 10 avril 2026 (13:45 - 14:45).

Description

  • Orateur

    Min-Yi Shen - No Affiliation

One of the fundamental hardness assumptions underlying isogeny-based cryptography is the problem of finding a non-trivial endomorphism of a given supersingular elliptic curve. In this talk, we show that the problem is related to the problem of finding a splitting of a principally polarised superspecial abelian surface. In particular, we provide formal security reductions and a proof-of-concept implementation of an algorithm to compute endomorphisms of elliptic curves by solving the splitting problem. This is joint work with Sabrina Kunzweiler.

Infos pratiques

Prochains exposés

  • TBA

    • 18 septembre 2026 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Orateur : Eran Lambooij - Inria

    • Cryptography

  • Key Attack on the ACDGV Matrix Encryption Scheme

    • 25 septembre 2026 (13:45 - 14:45)

    • IRMAR - Université de Rennes - Campus Beaulieu Bat. 22, RDC, Rennes - Amphi Lebesgue

    Orateur : Anmoal Porwal - Technical University of Munich

    I will present our key-recovery attack on the ACDGV public-key encryption scheme proposed at ASIACRYPT 2024 by Aragon, Couvreur, Dyseryn, Gaborit, and Vinçotte. The secret key is a Gabidulin code hidden by appending random rows and columns and by left- and right-multiplication with invertible matrices. Our attack exploits the resulting algebraic structure to recover an equivalent secret key. It[…]

    • Cryptography

    • Asymmetric primitive

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