Compact e-cash from bounded accumulator



Publication Details

Au, M., Wu, Q., Susilo, W. & Mu, Y. (2007). Compact e-cash from bounded accumulator. Topics in Cryptology - CT-RSA 2007 (pp. 178-195). Germany: Springer-Verlag.


Known compact e-cash schemes are constructed from signature schemes with efficient protocols and verifiable random functions. In this paper, we introduce a different approach. We construct compact e-cash schemes from bounded accumulators. A bounded accumulator is an accumulator with a limit on the number of accumulated values. We show a generic construction of compact e-cash schemes from bounded accumulators and signature schemes with certain properties and instantiate it using an existing pairing-based accumulator and a new signature scheme. Our scheme revokes the secret key of the double-spender directly and thus supports more efficient coin tracing. The new signature scheme has an interesting property that is has the message space of a cyclic group G1 equipped with a bilinear pairing, with efficient protocol to show possession of a signature without revealing the signature nor the message. We show that the new scheme is secure in the generic group model. The new signature scheme may be of independent interest.

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