近年來，由於網際網路的快速發展和個人電腦的普及化，人們漸漸使用電子商務所提供的各種服務，然而電子現金和電子支票較為一般大眾所接受，主要由於消費者不需攜帶大量金錢，只需透過網際網路就可以完成交易，而且每一筆交易都保有完整交易紀錄，可供消費者查詢消費紀錄。
本篇論文中，我們設計一個結合近端通訊的行動付費系統，建置於智慧型裝置上，我們採用智慧型裝置來模擬現今悠遊卡系統的架構，讓消費者可以將提領的電子現金利用發卡中心代理人將其充值於智慧型裝置中，當消費者帳戶額度不足時，可以使用智慧型裝置直接充值，而不需要到發卡中心所提供的定點來進行充值，可以提升消費者使用的意願和方便性。
在本篇論文的協定執行效率上，採用後門雜湊函數運算系統，將其區分成線上計算和離線計算，較為龐大的簽章運算和驗證階段皆可以在離線階段完成，而線上階段只需一次的整數乘法運算，較以往的方法而言，我們的協定擁有更佳的線上計算效率，可以大幅減少行動裝置的運算量，因此我們所提出的協定更適合應用於行動裝置上。

Recently, owing to the rapid progress of the Internet and information technologies, people use various services provided by E-commerce gradually. Electronic cash and electronic check have widely accepted due to the customer can achieve the whole transactions through the Internet instead of carrying plenty of money. Moreover, every transaction will keep the complete records into database for inquiring.
In this thesis, we design the NFC mobile payment with smart mobile devices; we adopt the smart mobile device to simulate the Easy card system. The customer uses card issuer agent to recharge the withdrawal amount into smart mobile device. When the balance of customer’s account is deficient, they can recharge with smart mobile device instead of recharging spot. It can enhance the usability and convenience.
We used the trapdoor hash function in our protocol. The computational cost can divide into on-line and off-line computation. The larger computational cost for signature generation and authentication can be achieved in off-line phase, however, the on-line phase only need one integer multiplication. For the existing protocols, our protocol not only has better efficiency of on-line computation but also reducing the burden of mobile devices. Therefore, our system is suitable for the mobile devices.

目錄
誌謝 IV
中文摘要 V
ABSTRACT VI
目錄 VIII
表目錄 X
圖目錄 XI
第一章 緒論 1
1.1 電子現金結合近端通訊之研究 1
1.1.1 前言 1
1.1.2 研究動機 1
1.1.3 研究目的 2
1.2 論文架構 4
第二章 相關知識與技術探討 5
2.1 電子現金交易系統(E-cash system) 5
2.2 近端通訊(Near Field Communication) 6
2.3 RSA數位簽章系統(RSA Digital Signature System) 9
2.4 無碰撞單向雜湊函數(Collision-free One Way Hash Function) 10
2.5 後門雜湊函數(Trapdoor Hash Function) 11
第三章 近端通訊之行動付費系統 14
3.1 文獻回顧 14
3.1.1 回顧Chang學者的協定 14
3.1.2 回顧Juang學者的協定 16
3.2 系統環境及流程說明 18
3.3 參數符號定義 21
3.4 近端通訊之行動付費系統 22
3.4.1 前言 22
3.4.2 註冊階段 23
3.4.3 消費(充值)階段 24
3.4.4 付款階段 26
3.4.5 回存階段 26
第四章 分析與討論 28
4.1 安全性分析 28
4.2 效能分析 30
第五章 結論 33
參考文獻 34
附錄 37
附錄I: 作者簡介 37
附錄II：口試委員意見修正 38
表目錄
表 一、 先前學者與我們的方案之執行效率比較 先前學者與我們的方案之執行效率比較 先前學者與我們的方案之執行效率比較 先前學者與我們的方案之執行效率比較 先前學者與我們的方案之執行效率比較 先前學者與我們的方案之執行效率比較 30
表 二、 口試委員意見及勘誤修正表 口試委員意見及勘誤修正表 口試委員意見及勘誤修正表 口試委員意見及勘誤修正表 38
圖目錄
圖 1. Chang1. Chang 1. Chang 1. Chang1. Chang1. Chang學者的協定 -提款階段 15
圖 2. Chang2. Chang 2. Chang 2. Chang2. Chang2. Chang學者的協定 -日期憑證產生階段 日期憑證產生階段 日期憑證產生階段 16
圖 3. Juang3. Juang 3. Juang3. Juang3. Juang 3. Juang學者的協定 學者的協定 -提款階段 18
圖 4. 4. 電子現 金系統流程圖 金系統流程圖 金系統流程圖 . 20
圖 5. 5. 消費者註冊階段 消費者註冊階段 消費者註冊階段 24
圖 6. 6. 消費 (充值 )階段 25
圖 7. 7. 付款階段 26
圖 8. 8. 回存階段 27

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