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DTSTART:20250330T010000
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DTSTART;TZID=Europe/Paris:20250611T140000
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DTSTAMP:20260413T050954
CREATED:20250527T091248Z
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UID:11874-1749650400-1749654000@www.greyc.fr
SUMMARY:Henry Bambury - Polytopes in the Fiat-Shamir with Aborts Paradigm
DESCRIPTION:Post-quantum digital signatures have sparked a lot of interest in the cryptographic community in recent years. Both the NIST-selected signature Dilithium and Heatae\, winner of the Korean PQC competition\, rely on hardness of lattice problems and employ the Fiat-Shamir with Aborts paradigm\, in which rejection sampling is used to eliminate a secret’s dependency on a given source distribution. The distribution used to conceal the secret has direct consequences on signature performances\, such as size\, speed and simplicity. Dilithium uses a simple hypercube uniform sampler\, while Haetae improves signature sizes by using a significantly more complex sampler based on Euclidean balls. In this work\, we propose a framework relying on uniform sampling in polytopes\, and use it to instantiate a new signature scheme: Patronus. Patronus acts as a tradeoff between both standards\, offering improved signature sizes compared to Dilithium\, while using a sampler that is much simpler than Haetae’s\, as it avoids the need for Gaussian sampling.
URL:https://www.greyc.fr/event/henry-bambury-polytopes-in-the-fiat-shamir-with-aborts-paradigm/
LOCATION:Sciences 3- S3 351
CATEGORIES:General,News,Safe,Séminaire Cryptologie et sécurité
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