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A Micro-payment System for Multiple-Shopping

In this paper, we propose a micro-payment system that is able to apply to several vendors using only one hash chain. Explicitly, this scheme can be considered as an improvement and extension of PayWord (8)suggested by Rivest and Shamir in 1996. We focus on the scheme that guarantees atomicity and non-repudiation among requirements for payment systems. Atomicity and non-repudiation play an important role in payment systems. In particular, atomicity allows customers to use the payment system without loss of their money in any disaster. Finally, when a customer uses the micro-payment over several vendors,we analyze not only the efficiency in terms of the storage size but also the security issues.