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Généralisation des protocoles en cas multi-utilisateurs

Abstract : In this thesis, we use building blocks to propose new one or with new interesting properties. First, we propose a attribute-based designated verifier signature thanks to an IBE. Security properties are proven under usual hypothesis. Then, we introduce our round-optimal constant-size blind signature thanks to Fischlin framework and NIZK. As a side result, we propose a constant-size signature on randomizable ciphertexts. Then, we introduce a new IBE which allows a tracer, given a tracing key associated to an identity, to filter all the ciphertexts that are sent to this specific identity (and only those). Two applications of this protocols are proposed. We show that our modification doesn’t alter the security of IBE. Finally, we present a threshold signature between an user, a token and a server thanks to different building blocks like SPHF or assymetric Waters signature. The security of the construction is proven under regular assumptions like CDH+ or DDH.
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Submitted on : Tuesday, January 19, 2021 - 3:57:08 PM
Last modification on : Thursday, September 8, 2022 - 3:57:12 AM
Long-term archiving on: : Tuesday, April 20, 2021 - 7:48:00 PM


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  • HAL Id : tel-03115390, version 1



Laura Brouilhet. Généralisation des protocoles en cas multi-utilisateurs. Cryptographie et sécurité [cs.CR]. Université de Limoges, 2020. Français. ⟨NNT : 2020LIMO0062⟩. ⟨tel-03115390⟩



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