Cryptology ePrint Archive: Report 2015/086

Practical Compact E-Cash with Arbitrary Wallet Size

Patrick Märtens

Abstract: Compact e-cash schemes allow users to withdraw a wallet containing $K$ coins and to spend each coin unlinkably. We present the first compact e-cash scheme with arbitrary wallet size $k \leq K$ while the spending protocol is of constant time and space complexity. Known compact e-cash schemes are constructed from either verifiable random functions or bounded accumulators. We use both building blocks to construct the new scheme which is secure under the $q$-SDH, the $y$-DDHI and the SXDH assumptions in the random oracle model.

Category / Keywords: E-Cash, compact, constant-size, arbitrary wallet size, accumulator, pairings

Date: received 4 Feb 2015

Contact author: patrickmaertens at gmx de

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Version: 20150214:085029 (All versions of this report)

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