臺灣博碩士論文加值系統

近年來在各種電子商務研究中, 電子現金引起相當多的關注. 而且在現在的社會, 線上購物已經成為一個趨勢了, 所以對於電子現金相關的研究也變得越來越重要. 目前各種電子商務所使用的付費方式大多都是線上刷卡或轉帳. 但是使用這類的付費方式個人的交易紀錄都會記錄在銀行裡, 如果有心人要查詢你的交易紀錄都會被知道, 個人隱私完全暴露出來了. 因此為了保護每個人的個人隱私, 此篇我們的目標就是要設計出一個安全的電子現金系統.
此篇我們使用到一個變色龍雜湊函數, 這個雜湊函數含有抵抗碰撞, 暗門式碰撞, 均一性這三種特性. 在我們的電子現金研究當中,利用變色龍雜湊函數讓我們的電子現金系統更安全, 更有效率.

In recent years considerable attention has arisen over the electronic cash in various electronic commerce services. In modern life, to buy commodity through Internet is the major trend, so electronic cash systems become more and more important. A payment scheme of electronic commerce is using a credit card. In this way, the user has no privacy because the bank knows the user''s transaction records.
In order to protect user''s privacy, it will be a target to design the secure anonymous electronic cash scheme. The chameleon hash is a trapdoor one-way hash function. The collision resistance, trapdoor collisions, and uniformity are famous properties of chameleon hash. Based on these properties, we proposed a chameleon-hash-based scheme that can be used in electronic cash applications. In this study, we will investigate electronic cash techniques based on chameleon hash. We want our electronic cash scheme is more secure and efficiency.

摘要 I
Abstract II
List of Figures VI
1 Introduction 1
2 Preliminary 3
3 A Digital Master-ticket City-pass Scheme Based on Chameleon
Hash 5
3.1 Proposed Scheme . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1 Setup Phase: . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.2 Register Phase: . . . . . . . . . . . . . . . . . . . . . . 8
3.1.3 Sub-ticket Generating Phase: . . . . . . . . . . . . . . 10
3.1.4 Authentication Phase: . . . . . . . . . . . . . . . . . . 13
3.2 Security Analysis . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Electronic Cash Scheme 19
4.1 Proposed Scheme . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1 Setup Phase: . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.2 Register Phase: . . . . . . . . . . . . . . . . . . . . . . 21
4.1.3 Withdrawal Phase: . . . . . . . . . . . . . . . . . . . . 22
4.1.4 Payment Phase: . . . . . . . . . . . . . . . . . . . . . . 24
4.2 Security Analysis . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 Conclusions 28
References 29

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