| Summary: | 碩士 === 國立嘉義大學 === 資訊工程學系研究所 === 95 === With the popularization of the network, the network payment has already become a trend. The electronic cash (e-cash) is one kind of payment; however, although the various types of demands in e-cash have been conceived out, the e-cash scheme with fairness property was not yet proposed. In this thesis, we present a novel electronic cash structure, which uses a verifiable encryption and a restrictive blind signature to construct a electronic cash system with fairness between customers and merchants. The proposed e-cash scheme properly combines the payment protocol with a fair exchange procedure, so that the customer and the merchant can fairly exchange their money and goods. Our scheme can maintain fairness with the aid of an off-line trusted third party (off-line TTP). That means in the normal case, the customer and the merchant can receive their desired items without TTP’s participation. However, only when a dispute occurs, the TTP can help both parties resolve the problem and make transaction be fair. Moreover, this system can also protect customer’s privacy, and prevent some hostile deceptions like double spending, and stealing.
Keywords：Electronic Cash, Fair Exchange, Verifiable Encryption, Electronic Commerce.
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