Secure Web Services Protocol for Fair Contract Signing with Off-line Semi-Trusted Third Party

• Main Authors: Zong-Jie Wu, 吳宗潔
• Other Authors: Woei-Jiunn Tsaur
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/43123097961485564329

碩士 === 大葉大學 === 資訊管理學系碩士班 === 92 === 　　Fairness becomes a key factor while a data exchange since the transaction is conducted over the Internet. To start the data exchange, confidential data, payments, and signatures need to be transmitted. Main parties are afraid of they cannot get electronic documents from the other side safely while the data exchange. To ensure the fairness of data exchange, the protocol needs a trusted third party be a judge when the dispute occurs, and has to give a guarantee to main parties during the data exchange. 　　Online contract signing is a kind of fair exchange. In addition to traditional contract signing, online contract signing has become a flexible method in business. Online contract signing consists of three main parties, including two signers and trusted third party. Currently, in the studies, most of the third parties are either online semi-trusted third party or off-line trusted third party. To eliminate the third party’s connectional time and enhance its security, a secure and efficient protocol for fair contract signing with off-line semi-trusted third party has proposed in the proposed protocol, where a flexible method for selecting a semi-trusted third party is proposed actually. The online contract signing is still fair while the third party is off-line and main parties can rely on the semi-trusted with third party. Finally, in the thesis, the proposed protocol is extended to Web services so that it can be used for main parties in different platforms.