656 results

  • Predicting Module-Lattice Reduction

    • December 19, 2025 (13:45 - 14:45)

    • Batiment 22-23 salle 16 (en face de l'amphi Lebesgue)

    Speaker : Paola de Perthuis - CWI

    Is module-lattice reduction better than unstructured lattice reduction? This question was highlighted as `Q8' in the Kyber NIST standardization submission (Avanzi et al., 2021), as potentially affecting the concrete security of Kyber and other module-lattice-based schemes. Foundational works on module-lattice reduction (Lee, Pellet-Mary, Stehlé, and Wallet, ASIACRYPT 2019; Mukherjee and Stephens[…]

    • Cryptography

  • Should I trust or should I go? A deep dive into the (not so reliable) web PKI trust model

    • December 19, 2025 (11:00 - 12:00)

    • Inria Center of the University of Rennes - Room Markov

    Speaker : Romain Laborde - University of Toulouse

    The padlock shown in the URL bar of our favorite web browser indicates that we are connected using a secure HTTPS connection and providing some sense of security. Unfortunately, the reality is slightly more complex. The trust model of the underlying Web PKI is invalid, making TLS a colossus with feet of clay. In this talk, we will dive into the trust model of the web PKI ecosystem to understand[…]

    • SoSysec

    • Protocols

    • Network

  • Post-Quantum Public-Key Pseudorandom Correlation Functions for OT

    • December 12, 2025 (13:45 - 14:45)

    • Salle Guernesey à l'ISTIC

    Speaker : Mahshid Riahinia - ENS, CNRS

    Public-Key Pseudorandom Correlation Functions (PK-PCF) are an exciting recent primitive introduced to enable fast secure computation. Despite significant advances in the group-based setting, success in the post-quantum regime has been much more limited. In this talk, I will introduce an efficient lattice-based PK-PCF for the string OT correlation. At the heart of our result lie several technical[…]

  • Hardware-Software Co-Designs for Microarchitectural Security

    • December 11, 2025 (11:00 - 12:00)

    • Inria Center of the University of Rennes - Room Petri/Turing

    Speaker : Lesly-Ann Daniel - EURECOM

    Microarchitectural optimizations, such as caches and speculative out-of-order execution, are essential for achieving high performance. However, these same mechanisms also open the door to attacks that can undermine software-enforced security policies. The current gold standard for defending against such attacks is the constant-time programming discipline, which prohibits secret-dependent control[…]

    • SoSysec

    • Hardware/software co-design

    • Micro-architectural vulnerabilities

  • Structured-Seed Local Pseudorandom Generators and their Applications

    • December 05, 2025 (13:45 - 14:45)

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

    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

  • Blockchain and digital currencies: between European regulation and technological challenges

    • December 05, 2025 (11:00 - 12:00)

    • Inria Center of the University of Rennes - Aurigny room

    Speaker : Loïc Miller - CentraleSupélec

    As the European Union develops a legal framework for crypto-assets and data protection, the technological question underlying the emergence of a genuine digital currency remains open. Blockchain today stands as an interdisciplinary field of study at the crossroads of computer science, economics, and law. This presentation will place the ongoing regulatory framework in perspective with the[…]

    • SoSysec

    • Distributed systems

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