兼具使用者認證之有效率的電子訂閱系統 邱信富、曹偉駿

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兼具使用者認證之有效率的電子訂閱系統 邱信富、曹偉駿

E-mail: 9019980@mail.dyu.edu.tw

摘 要

預期日後的出版型態,將是平面與電子版本同?發行的局面,基於「使用者付費」的原則,本論文提出一電子訂閱系統,

使得使用者可依其需要或興趣,付費購買部分電子刊物的閱讀權利。本論文整合存取控制機制、橢圓曲線密碼系統與自我 認證公開金鑰密碼系統的安全特性,並結合公平交換協定,來建構一個安全的電子訂閱環境。本論文所提出的電子訂閱系 統具有下列優點: 1. 使用者和出版商之間可以不必依靠公正的第三單位所簽發的數位憑證以驗證彼此的身分。 2. 植基於 橢圓曲線密碼系統的安全特性,以更少的位元數來達到相同的安全等級。 3. 運用公平交換的原理,處理使用者訂閱的相關 資訊,以維護雙方權益。 4. 不論訂閱期限的長短,訂閱者只需保有一把秘密金鑰,系統即能判別所有訂閱期之刊物的使用 權限。 5. 當訂閱者的訂閱期限到期時,秘密金鑰即自動失效,換言之逾期的秘密金鑰會失去閱讀刊物的權利。 6. 本電子 訂閱系統能夠防止攻擊者的偽冒及重送攻擊。

關鍵詞 : 橢圓曲線密碼系統、自我認證公開金鑰密碼系統、公平交換協定、存取控制、使用者認證 目錄

第一章 緒 論--P1 1.1 研究背景與動機--P1 1.2 研究目的--P3 1.3 研究架構--P4 1.4 論文架構--P6 第二章 文獻探討--P7 2.1 電子 商務安全需求--P7 2.2 電子書--P11 2.3 密碼學背景--P14 2.4 公開金鑰密碼系統--P17 2.4.1 憑證為基礎的公開金鑰密碼系 統--P18 2.4.2 身份為基礎的公開金鑰密碼系統--P18 2.4.3 自我認證公開金鑰密碼系統--P20 2.4.4 橢圓曲線公開金鑰密碼系 統--P24 2.5 公平交換協定--P29 2.5.1 On-line TTP--P29 2.5.2 Off-line TTP--P31 2.6 存取控制機制--P33 第三章 兼具使用者認 證之電子訂閱系統--P36 3.1 植基於自我認證公開金鑰密碼系統的公平交換協定CEMBS--P36 3.2 安全電子訂閱系統之設 計--P40 第四章 安全及複雜度分析--P45 4.1 安全性分析--P45 4.2 計算複雜度分析--P48 4.3 資料傳輸量分析--P52 第五章 結論 與建議--P55 參考文獻--P57 附錄一:PEDLDLL憑證--P62

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