在這短暫的30年間，網際網路可說是以爆炸性的速度在發展，加上個人電腦與行動設備的普及化，人與人之間的距離縮短了、溝通更便利了，人們漸漸的無法脫離網路，當許多生活鎖事都必須使用網路時，電子商務服務也將越來越重要。透過網際網路以及電子現金，使用者將不再需要攜帶實體的金錢，也不受限在任何的地點，只需打開網際網路，就可以在線上進行交易與消費，每次交易都會有紀錄，也方便自己可以統計所消費之金額。
基於行動支付的便利性，我們提出了一個二維條碼電子現金系統，利用智慧型裝置來實現錢包電子化之理想。在本篇論文中採用後門雜湊函數運算系統，將過去使用者只能向銀行提領固定面額的電子現金模式給改變，透過此系統使用者將可以跟認證中心申請電子憑證，並利用此憑證來簽署想要的金額，讓使用者更靈活運用在智慧型裝置上。

In the past thirty years, the Internet has been developing explosively rapidly. Now that personal computers and mobile devices have reached most households and people, the distance between people seems to be shortened and it is a lot more convenient to communicate with others. The Internet has made life very convenient. Since the Internet is required for many things in day-to-day living, e-commerce services have become more significant than before. Through the Internet and electronic cash, users will no longer need to carry around physical money and neither will they be bound to certain places to make purchase. Users will only need to connect to the Internet to make trading and purchase online. Records of trading will be saved to allow users to keep track of expenses.
To utilize the convenience of mobile pays, this paper proposes a QR code electronic cash system to realize the concept of electronic wallet through smart mobile devices. In the present study, the trapdoor hash function was used to readjust the electronic cash withdrawal system through which users withdraw fixed-amount electronic cash from bank. In the system proposed by this paper, users can apply to a certification center for digital certificate and use the certificate to register the amount they wish to withdraw. The proposed system provides more flexibility in handling electronic cash on smart mobile devices.

中文摘要 I
ABSTRACT II
目錄 IV
表目錄 VII
圖目錄 VIII
第一章 緒論 1
1.1 電子現金結合二維條碼之研究 1
1.1.1 前言 1
1.1.2 研究動機 2
1.1.3 研究目的 3
1.2 論文架構 5
第二章 相關知識與技術探討 7
2.1 電子現金系統(E-cash System) 7
2.2 QR Code(Quick Response Code) 8
2.3 後門雜湊函數(Trapdoor Hash Function) 10
第三章 二維條碼之電子現金系統 12
3.1 系統環境說明 12
3.2 系統架構流程 13
3.3 系統流程步驟 14
3.4 二維條碼電子現金系統 15
3.4.1 前言 15
3.4.2 參數符號定義 15
3.4.3 註冊階段 18
3.4.4 提領階段 19
3.4.5 交易階段 22
3.4.6 回存階段 25
第四章 現行台灣電子支付系統使用比較 28
4.1 Apple Pay 28
4.2 悠遊卡 29
4.3 歐付寶 30
4.4 支付寶 31
4.5 系統比較分析 33
第五章 安全性分析 36
第六章 結論 39
參考文獻 40
附錄 43
附錄 I : 作者簡介 43
附錄II : 口試委員意見修正 44

表目錄
表一、QR Code儲存容量表 9
表二、各種電子支付系統比較 33
表三、口試委員意見及勘誤修正表 44


圖目錄
圖 1. QR Code的結構 9
圖 2. 系統流程圖 13
圖 3. 使用者註冊階段 19
圖 4. 使用者提領階段 21
圖 5. 使用者與接收者交易階段 24
圖 6. 使用者回存階段 27
圖 7. Apple Pay交易流程 29
圖 8. 悠遊卡交易流程 30
圖 9. 歐付寶交易流程 31
圖 10. 支付寶交易流程 32

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