Anonymous transferable e-cash Conference Paper

Author(s): Baldimtsi, Foteini; Chase, Melissa; Fuchsbauer, Georg; Kohlweiss, Markulf
Title: Anonymous transferable e-cash
Title Series: LNCS
Affiliation IST Austria
Abstract: Cryptographic e-cash allows off-line electronic transactions between a bank, users and merchants in a secure and anonymous fashion. A plethora of e-cash constructions has been proposed in the literature; however, these traditional e-cash schemes only allow coins to be transferred once between users and merchants. Ideally, we would like users to be able to transfer coins between each other multiple times before deposit, as happens with physical cash. “Transferable” e-cash schemes are the solution to this problem. Unfortunately, the currently proposed schemes are either completely impractical or do not achieve the desirable anonymity properties without compromises, such as assuming the existence of a trusted “judge” who can trace all coins and users in the system. This paper presents the first efficient and fully anonymous transferable e-cash scheme without any trusted third parties. We start by revising the security and anonymity properties of transferable e-cash to capture issues that were previously overlooked. For our construction we use the recently proposed malleable signatures by Chase et al. to allow the secure and anonymous transfer of coins, combined with a new efficient double-spending detection mechanism. Finally, we discuss an instantiation of our construction.
Keywords: Double-spending detection; Electronic payments; Malleable signatures; Transferable e-cash
Conference Title: PKC: Public Key Crypography
Volume: 9020
Conference Dates: March 30 - April 1, 2015
Conference Location: Gaithersburg, MD, USA
ISBN: 978-3-642-54630-3
Publisher: Springer  
Date Published: 2015-01-01
Start Page: 101
End Page: 124
Sponsor: Work done as an intern in Microsoft Research Redmond and as a student at Brown University, where supported by NSF grant 0964379. Supported by the European Research Council, ERC Starting Grant (259668-PSPC).
DOI: 10.1007/978-3-662-46447-2_5
Open access: no
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