Cryptology ePrint Archive: Report 2017/1220

Off-line Digital Cash Schemes Providing Unlinkability, Anonymity and Change

Lynn Batten and Xun Yi

Abstract: Several ecash systems have been proposed in the last twenty years or so, each offering features similar to real cash. One feature which to date has not been provided is that of a payee giving change to a payer for an e-coin in an off-line setting. In this paper, we indicate how an off-line ecash system can solve the change-giving problem. In addition, our protocol provides the usual expected features of anonymity and unlinkability of the payer, but can reveal the identity of an individual who illegally tries to spend ecash twice.

Category / Keywords: Digital money, group blind signature, double spending

Original Publication (with minor differences): Journal of Electronic Commerce Research

Date: received 15 Dec 2017, last revised 31 Jan 2018

Contact author: lynn batten at deakin edu au

Available format(s): PDF | BibTeX Citation

Note: Subsequent to the initial upload on ePrint, the paper was accepted by a journal with some revisions.

Version: 20180201:011911 (All versions of this report)

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