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研究生： 唐天凱
Togu - Turnip
論文名稱： 適用於行動網路之匿名式群體金鑰交換協議
Anonymous Group Key Agreement Scheme for Mobile Networks
指導教授： 吳宗成
Tzong-Chen Wu
口試委員: 陳正綱
Cheng-Kang Chen
羅乃維
Nai-Wei Lo
學位類別： 碩士
Master
系所名稱： 管理學院 - 資訊管理系
Department of Information Management
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 67
中文關鍵詞： 匿名 、群組通訊 、動態群組 、群體認證金鑰交換之通訊協定 、憑證公開金鑰密碼系統 、個人隱私 、霍夫曼密鑰樹 、非雙線性函數。
外文關鍵詞： anonymous, group communication, dynamic group, authenticated group key agreement, certificateless, privacy, Huffman key tree, pairing-free
相關次數： 點閱：284  下載：7 
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    • 為因應群組使用的軟體成長需求，安全又可倚賴的群組通訊已在行動網路中普及。為了使群組通訊安全無虞，一些根據憑證公開金鑰密碼系統的群體認證金鑰交換之通訊協定 已被提出來。群體認證金鑰交換之通訊協定確保群組成員能夠在不安全的網絡中安全地通訊。然而，大多數的群體認證金鑰交換之通訊協定在使用雙線性函數的情形及不認證使用者身分下被實行。
    在此論文中，作者提出不具鑑別性群體認證金鑰交換之通訊協定，並因計算複雜性的緣故在資源有限的行動裝置中不使用雙線性函數。此協定也提供了加入及離開群組的流程讓群組運作更有彈性，並採納了霍夫曼密鑰樹去使交涉回合降到最低，並減少電腦運算的成本。
    此論文分析了此方案的安全性及此方案想獲得的安全性及使用者。除此之外，此方案的安全性也用BAN邏輯來評估，它讓每個群組成員都能產生一個新的、共同的、安全分享的密碼。最後，此方案與現存的群體認證金鑰交換之通訊協定相比，在通訊及計算複雜性也有較好的效率。因此，此方案適合應用在資源有限的行動裝置上。

    Because of growing demand of the group-oriented applications, the secure and reliable group communication increases popularity in mobile networks. For securing group communications, a number of authenticated group key agreement (AGKA) schemes have been proposed based on certificateless public key cryptography (CL-PKC). AGKA scheme ensures group members to communicate with each other securely over insecure networks. However, the most of the AGKA schemes are implemented using bilinear pairing and without consideration of the user anonymity feature.
    In this thesis, the author proposed an anonymous certificateless authenticated group key agreement scheme without using bilinear pairing for resource-limited mobile devices due to the heavy computational overhead. The proposed scheme also provides join and leave procedures to enable the dynamic group operations by adopting Huffman key tree in order to minimize the negotiation rounds and reduce computational costs.
    This thesis analyzed the security of the proposed scheme and the proposed scheme obtains the desired security attributes with anonymity. Moreover, the security of proposed scheme was also evaluated by using BAN logic which shows that each group members generate a fresh, common and secure shared group key. Finally, the proposed scheme has relatively efficient performance in terms of communication and computation overheads than the others existing CL-PKC schemes. Hence, the proposed scheme is suitable to be used for resource-limited mobile devices.

    摘要 ii Abstract iii Acknowledgement iv Table of Contents v List of Figures vii List of Tables viii Chapter 1 Introduction 1 1.1 Background 1 1.2 Motivation 3 1.3 Objectives 4 1.4 Thesis Organization 4 Chapter 2 Related Work 6 2.1 Group Key Agreement Schemes 6 2.2 Anonymous Authentication and Key Agreement Schemes 8 Chapter 3 Preliminary 10 3.1 System Overview of Group Communication 10 3.2 Predefined Concepts 12 3.2.1 Huffman-Key-Tree Structure 12 3.2.2 Computational Problems 14 3.2.3 Security Requirements 14 Chapter 4 Proposed Scheme 16 4.1 Initialization Phase 17 4.2 Huffman Key Tree Construction Phase 19 4.3 Anonymous Group Key Establishment Phase 20 4.3.1 Phase I: Anonymous Key-Exchange of Two Adjacent Users 21 4.3.2 Phase II: Anonymous Group Key Generation 24 4.4 New Member Joining Phase 25 4.5 An Existing Member Leaving Phase 30 Chapter 5 Security and Performance Analysis 33 5.1 Security Analysis 33 5.1.1 Formal Security Proof Using BAN Logic 33 5.1.2 Security Analysis for Various Attack Scenarios 43 5.2 Performance Analysis 47 Chapter 6 Conclusion 51 6.1 Conclusion 51 6.2 Future Work 52 Appendix I 57 Appendix II 58

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