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Achieving Optimal Anonymity in Transferable E-Cash with a Judge

Abstract : Electronic cash (e-cash) refers to money exchanged electronically. The main features of traditional cash are usually considered desirable also in the context of e-cash. One such property is off-line transferability, meaning the recipient of a coin in a transaction can transfer it in a later payment transaction to a third person without contacting a central authority. Among security properties, the anonymity of the payer in such transactions has been widely studied. This paper proposes the first efficient and secure transferable e-cash scheme with the strongest achievable anonymity properties, introduced by Canard and Gouget. In particular, it should not be possible for adversaries who receive a coin to decide whether they have owned that coin before. Our proposal is based on two recent cryptographic primitives: the proof system by Groth and Sahai, whose randomizability enables strong anonymity, and the commuting signatures by Fuchsbauer, which allow one to sign values that are only given as encryptions.
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https://hal.inria.fr/hal-01110485
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Submitted on : Wednesday, January 28, 2015 - 11:54:59 AM
Last modification on : Tuesday, May 4, 2021 - 2:06:02 PM

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Olivier Blazy, Sébastien Canard, Georg Fuchsbauer, Aline Gouget, Hervé Sibert, et al.. Achieving Optimal Anonymity in Transferable E-Cash with a Judge. AFRICACRYPT 2011 - 4th International Conference on Cryptology in Africa, Jul 2011, Dakar, Senegal. pp.206-223, ⟨10.1007/978-3-642-21969-6_13⟩. ⟨hal-01110485⟩

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