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Transferable e-cash: an analysis in the Algebraic Group Model

Balthazar Bauer 1, 2, 3
3 CASCADE - Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities
DI-ENS - Département d'informatique de l'École normale supérieure, CNRS - Centre National de la Recherche Scientifique : UMR 8548, Inria de Paris
Abstract : Transferable e-cash is the most faithful digital analog of physical cash, as it allows users to transfer coins between themwithout interacting with the bank. Strong anonymity requirements and the need for mechanisms to trace illegal behavior(double-spending of coins) have made instantiating the concept notoriously hard. Baldimtsi et al. (PKC’15) have given afirst instantiation, which however relied on a powerful cryptographic primitive that made the scheme non-practical. In thisthesis we revisit the model for transferable e-cash, proposing simpler yet stronger security definitions and then give thefirst concrete instantiation of the primitive, basing it on bilinear groups, and analyze its concrete efficiency. Because tobuild our scheme, we are using non-standard assumption in a bilinear group context, we analyze the hardness of a broadclass of assumptions in a relevant context: the algebraic group model.
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https://hal.inria.fr/tel-03086982
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Submitted on : Wednesday, December 23, 2020 - 10:24:57 AM
Last modification on : Thursday, December 24, 2020 - 3:30:41 AM

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Balthazar Bauer. Transferable e-cash: an analysis in the Algebraic Group Model. Cryptography and Security [cs.CR]. ED 386 : École doctorale de sciences mathématiques de Paris centre, UPMC, 2020. English. ⟨tel-03086982⟩

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