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研究生:林志明
研究生(外文):Chih-Ming Lin
論文名稱:ㄧ個經由中立發行者達到可更新電子錢幣的架構
論文名稱(外文):A Renewable E-Coin Scheme with a Third-Party Issuer
指導教授:伍麗樵伍麗樵引用關係
指導教授(外文):Lih-Chyau Wuu
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:資訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2005
畢業學年度:93
語文別:英文
論文頁數:60
中文關鍵詞:電子錢幣面額可更新電子商務雜湊函數鏈
外文關鍵詞:hash chaindenominationrenewablee-coine-commerce
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  • 被引用被引用:1
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本論文提出一可使電子錢幣具有流通性之線上電子錢幣系統。本系統由消費者、商家、銀行與發行者等成員所組成,同時包含基本與進階等兩種運作模式。在基本模式下,發行者必須是一個具有公信力的第三者,而在進階模式下,我們藉由雜湊函數鏈的機制消除這個限制。在系統中,電子錢幣由其擁有者所自行產生,並包含一個私密值與其相對應的公開值。私密值是一個由錢幣擁有者所選取的亂數,而公開值則是其雜湊函數值。在錢幣提領階段,公開值必須由發行者公告在他的公佈欄,電子錢幣才能被合法使用。而在付費階段,發行者必須取代銀行在線上擔任錢幣合法性的驗證者並更新電子錢幣,這裡所指的更新錢幣是發行者將消費者錢幣的公開值換成商家錢幣的公開值以完成電子錢幣的轉移。這樣的置換方式我們稱之為更新,這也讓電子錢幣可以在使用者之間流通。而爲了避免發行者成為系統中的瓶頸,電子錢幣可以分散給許多個發行者管理以減輕其負擔。此外,不同的佈告欄可以用來公佈不同面額的電子錢幣,如此ㄧ來,不但電子錢幣可以流通,商家也能在交易時找零給消費者。
In this dissertation, we propose an efficient on-line e-coin system which achieves circulation of e-coins. The proposed system has four parties: Consumer, Merchant, Bank and Issuer, and two operating modes: basic mode and enhanced mode. It is essential to have a trustworthy Issuer in the basic mode, but the enhanced mode applies the hash chain technique to conquer the assumption that Issuer must be honest. In our system, an e-coin is generated by its owner and consists of a secret value, c, and a public value, c''=h(c), where h() is a secure one-way hash function. The public value of an e-coin is published by Issuer (delegated by Bank) on his bulletin board in withdrawal phase. Instead of Bank, Issuer has to be on-line to verify and renew e-coins during payment phase. That is, Issuer replaces the public values of Consumer''s e-coins with Merchant''s ones denoting the amount of money which must be paid in a transaction. Such a replacement is called as renewal and that makes the coin can circulate among users. Both of the communication bottleneck and the storage overhead occurring in Issuer can be distributed by using different bulletin boards of several Issuers. Besides, different bulletin boards can be used to represent e-coins of various denominations. With the features of renewal and various denominations, not only e-coin can circulate among users but Merchant has the capability to give change to Consumer.
Abstract i
Acknowledgements ii
Contents iii
List of Figures iv
List of Tables v
1. Introduction 1
2. Related Works 3
2.1 SOCPT [18]: 3
2.2 Vishwas Patil et al.’s payment system [21]: 5
2.3 PayWord [23]: 7
2.4 NetBill [25]: 9
2.5 Robert Tracz et al.’s Payment System [27]: 11
2.6 PayFair [32]: 13
2.7 Yang Zongkai et al.’s Payment System [34]: 15
3. System Architecture 17
4. The Basic Mode 18
4.1 Withdrawal Phase 19
4.2 Payment Phase 22
4.3 Deposit Phase 24
4.4 Analysis 25
5. The Enhanced E-coin mode 28
5.1 Withdrawal Phase 30
5.2 Payment Phase 32
5.3 Deposit Phase 35
5.4 Analysis 36
5.5 Comparison 39
6. Coins of various denominations 42
7. Conclusion 47
Reference 48
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