小額電子支付系統之研究; The Research of Electronic Micropayment Systems

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題名:	小額電子支付系統之研究;The Research of Electronic Micropayment Systems
作者:	黃群凱;Chung-Kai Huang
貢獻者:	資訊工程研究所
關鍵詞:	權重式單向雜湊函數鏈;商店特有性;單向雜湊函數鏈;小額電子支付系統;電子支付系統;電子商務;merchant-specific;one-way hash chain;Electronic micropayment systems;Electronic payment systems;Electronic commerce;weighted one-way hash chain
日期:	2001-07-06
上傳時間:	2009-09-22 11:29:26 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	由於電子商務在網際網路上的蓬勃發展，電子支付系統在今日已然成為電子商務中相當重要的議題。其中，線上交易的安全性與便利性是消費者最關心的問題，電子支付系統中的小額電子付費更是邇來最熱門的研究主題之一。小額付費的概念普遍存在於目前的網際網路線上交易當中，例如線上算命、線上遊戲、線上資料庫查詢及購買單一網頁、文章或其他資料等等。小額電子支付系統研究濫觴於1995年，之後陸續有多位學者提出相關研究論文。至目前為止，大部份的小額電子支付系統都是根基於單向雜湊函數鏈（one-way hash chain）來形成小額電子錢幣鏈，並且儘量減少多餘的資料以及公開金鑰密碼技術的使用以降低進行交易和儲存資訊時所需的花費。然而這些根基於單向雜湊函數鏈的系統都面臨了商店特有性的問題，簡言之，就是一串小額電子錢幣鏈只能消費在某一已指定的商店，這個特性限制了小額電子支付系統的便利性。本論文的第三章，針對此一缺點，提出一個兼具彈性與效率的新系統稱為“FlexPay”。在此系統中，單一串小額電子錢幣鏈可以被使用在多個商店。為了提升單向雜湊函數鏈的效率，本論文的第四章提出一個新的機制稱為權重式單向雜湊函數鏈（weighted one-way hash chain）。此方法運用自我編碼（self-encoding）替每個小額電子錢幣加上權重以增加小額電子錢幣鏈的使用效能。小額電子錢幣鏈除了商店特有性的限制外，尚有其他的問題，例如：必須預先設定小額電子錢幣鏈的長度。針對此問題，澳洲學者Yi Mu在1997年提出了一個系統稱為“UPayWord”。該系統據稱解決了使用者必須預先設定小額電子錢幣鏈長度的限制，然而，卻破壞了小額電子錢幣鏈的“鏈結”重要特性。如此一來，造成消費者有機會欺騙商店以及商店在後續與銀行的清算階段出現爭端。在第五章中，針對此問題提出討論。最後，本論文提出未來可行的相關研究方向，包括將小額電子支付系統應用在行動電話上的付費以及將小額電子支付系統實作在個人數位助理（PDA）或智慧卡（smart card）上。 Electronic payment systems have gradually become an important issue nowadays because of the popularity and importance of e-commerce on the Internet. Security and convenience topics are most important issues that people concern. The electronic micropayment is one of the most popular research topics on the Internet based payment. Recently, many efficient micropayment schemes, based on the usage of one-way hash chain, were developed. They enable more and more new applications for e-commerce. However, all existing micropayment schemes suffer a common drawback that a generated chain of electronic coins can only be spent at a specific merchant. This special feature limits the widespread application of existing micropayment schemes. In this thesis, some nonmerchant-specific systems are reviewed. Then, a novel usage of hash chain is proposed and this leads to a flexible and efficient micropayment scheme, named the FlexPay. In FlexPay, the coins in the chain can be spent over many merchants. Therefore, based on the FlexPay scheme, it is possible that a large scale micropayment employed for a variety of applications among many merchants. In this thesis, we also design a novel construct of weighted one-way hash chain to improve the performance of a micropayment. We also show that the proposed technique is especially useful in implementing micropayment on a resource restrained computing device such as a hand-held computer. Finally, we give a comment on a PayWord based micropayment scheme, named the UPayWord. It is claimed that UPayWord can eliminate the constraint of the original PayWord in such a way that it does not require the users to set the length of the payword chains in advance. However, in this thesis, it will be shown that the UPayWord scheme violates the fundamental characteristics of one-way hash chain and will lead the merchants and the bank into dispute during the redemption phase. In summary, the UPayWord scheme does not resolve any disadvantage of the original PayWord scheme.
顯示於類別:	[資訊工程研究所] 博碩士論文

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