Anonymous Transferable E-Cash

Foteini Baldimtsi, Melissa Chase, Georg Fuchsbauer, Markulf Kohlweiss

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

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.
Original languageEnglish
Title of host publicationPublic-Key Cryptography - PKC 2015 - 18th IACR International Conference on Practice and Theory in Public-Key Cryptography, Gaithersburg, MD, USA, March 30 - April 1, 2015, Proceedings
Number of pages24
ISBN (Electronic) 978-3-662-46447-2
ISBN (Print)978-3-662-46446-5
Publication statusE-pub ahead of print - 17 Mar 2015
EventIACR International Conference on Practice and Theory of Public-Key Cryptography - Maryland, United States
Duration: 30 Mar 20151 Apr 2015


ConferenceIACR International Conference on Practice and Theory of Public-Key Cryptography
Abbreviated titlePKC 2015
Country/TerritoryUnited States
Internet address


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