Cryptology ePrint Archive: Report 2009/146

Transferable Constant-Size Fair E-Cash

Georg Fuchsbauer and David Pointcheval and Damien Vergnaud

Abstract: We propose an efficient blind certification protocol with interesting properties. 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 use blind certification 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.

Category / Keywords: anonymity, blind signatures, group signatures, transferable e-cash, fair e-cash

Publication Info: Appears in CANS 2009

Date: received 30 Mar 2009, last revised 26 Nov 2009

Contact author: fuchsbau at di ens fr

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Version: 20091126:121028 (All versions of this report)

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