Shopping systems using telecommunication technology have been receiving more and more attention because it allows cost reduction for merchants and provides convenience for consumers. To make them practical to our life, however, there is a critical problem to be solved: secure payment over networks. In this paper, we describe the implementation of secure electronic payment protocols for tele-shopping: the SET(Secure Electronic Transaction) protocol for credit card payment and the SSNS(Separate Serial Number Server) protocol for electronic cash payment. Credit cards are used worldwide in the real world and their payment process is implemented into electronic payment systems easily, while the electronic cash is useful especially for low priced purchases or for purchases requiring anonymity.
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