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Transferable Constant-Size Fair E-Cash

Georg Fuchsbauer 1, 2 David Pointcheval 1, 2 Damien Vergnaud 1, 2, 3, 4, *
* Corresponding author
2 CASCADE - Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities
DI-ENS - Département d'informatique de l'École normale supérieure, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR 8548
Abstract : We propose a new blind certification protocol that provides interesting properties while remaining efficient. It falls in the Groth-Sahai framework for witness-indistinguishable proofs, thus extended to a certified signature it immediately yields non-frameable group signatures. We then use it to build an efficient (offline) e-cash system that guarantees user anonymity and transferability of coins without increasing their size. As required for fair e-cash, in case of fraud, anonymity can be revoked by an authority, which is also crucial to deter from double spending.
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Georg Fuchsbauer, David Pointcheval, Damien Vergnaud. Transferable Constant-Size Fair E-Cash. Proceedings of the 8th International Workshop on Cryptology and Network Security (CANS '09), 2009, Kanazawa, Ishikawa, Japan. pp.226--247, ⟨10.1007/978-3-642-10433-6_15⟩. ⟨inria-00539543⟩

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