Cryptology ePrint Archive: Report 2014/352

Multi-Vendor PayWord with Payment Approval

Andrea Huszti

Abstract: One of the most well known micropayment scheme is the PayWord scheme. It is designed to be onevendor, so if we apply it for multiple vendors, it does not protect against double spending. We extended the PayWord scheme, it supports shopping at multiple vendors without an on-line broker or an on-line secure database. The proposed credit-based system uses one hash chain, hence besides the secret signature key only the seed and a random value should be securely stored. Our scheme is analyzed in applied pi calculus, we prove that it fulfills payment approval, secure payment authorization, secrecy of payment information and unreusability.

Category / Keywords: cryptographic protocols / PayWord, multi-vendor micropayment, payment approval, applied pi calculus

Original Publication (with minor differences): Proceedings of the 2013 International Conference on Security and Management. Las Vegas: CSREA Press, Las Vegas, 2013. pp. 265-271.

Date: received 19 May 2014

Contact author: huszti andrea at inf unideb hu

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Version: 20140520:084417 (All versions of this report)

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