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Transferable Constant-Size Fair E-Cash

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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Submitted on : Wednesday, November 24, 2010 - 3:39:27 PM
Last modification on : Thursday, April 28, 2022 - 3:47:57 PM
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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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