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 offers 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: applications / Digital money, group blind signature, double spending

Date: received 15 Dec 2017, last revised 21 Dec 2017

Contact author: lynn batten at deakin edu au

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Note: We were asked to use capitals only on first letters.

Version: 20171222:193819 (All versions of this report)

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