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688 results
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Seminar
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Cryptography
Ind-cpa-d insecurity of approximate and exact homomorphic encryption schemes
Speaker : Elias Suvanto - Cryptolab
Fully Homomorphic Encryption enables the evaluation of arbitrary circuits over encrypted data while maintaining the confidentiality of the underlying messages. It greatly enhances functionality but also comes with security challenges for some applications like Threshold FHE. While the standard IND-CPA security is sufficient against honest but curious adversaries, a stronger security notion called[…] -
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Seminar
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Cryptography
An extension of Overbeck’s attack with an application to cryptanalysis of Twisted Gabidulin-based schemes.
Speaker : Ilaria Zappatore - XLIM
In this talk, I will discuss the decoding of Gabidulin and related codes from a cryptographic point of view, pointing out that these codes can be decoded solely from the knowledge of a generator matrix. I will also present an extension of Gibson and Overbeck attacks on the generalized GPT encryption scheme (instantiated with the Gabidulin code) for different ranks of the distortion matrix. Finally[…] -
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Seminar
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Cryptography
Correction of dual lattice attacks
Speaker : Kevin Carrier - CY Cergy
The security of cryptographic systems such as Kyber and Dilithium (currently undergoing standardization by NIST) fundamentally hinges on the Learning With Errors (LWE) problem. However, the state of the art for attacking this problem is not yet entirely clear. Specifically, the validity of dual attacks on LWE is currently under scrutiny due to their analyses relying on heuristics that have proven[…] -
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Seminar
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Cryptography
Pseudorandom Correlation Generators from the Quasi-Abelian Decoding Problem
Speaker : Clément Ducros - IRIF
Secure multi-party computing often enhances efficiency by leveraging correlated randomness. Recently, Boyle et al. showcased the effectiveness of pseudorandom correlation generators (PCGs) in producing substantial correlated (pseudo)randomness, specifically for two-party random oblivious linear evaluations (OLEs). This process involves minimal interactions and subsequent local computations,[…] -
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Seminar
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Cryptography
Generic SCARE: reverse engineering without knowing the algorithm nor the machine
Speaker : Hélène LE BOUDER - IMT Atlantique
A novel side-channel-based reverse engineering technique is introduced, capable of reconstructing a procedure solely from inputs, outputs, and traces of execution. Beyond generic restrictions, no prior knowledge of the procedure or the chip it operates on is assumed. These restrictions confine the analysis to 8-bit RISC constant-time software implementations. Specifically, the feasibility of[…] -
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Seminar
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Cryptography
Evaluation embarquée de l'entropie d'un générateur d'aléa pour la cryptographie
Speaker : David Lubicz - DGA et IRMAR
Dans cet exposé, nous présentons une méthode de mesure embarquée de la composante thermique du jitter de phase d'un couple d'anneaux d'oscillateurs : cette mesure est nécessaire pour calculer le taux d'entropie d'un générateur d'aléa physique basé sur des anneaux oscillants. La précision de cette mesure dont le principe repose sur un algorithme de type Monte-Carlo dépend de l' équidistribution de[…] -