P2P網絡中的匿名通信算法研究

電子通信論文編號:TX253  論文字數:17539,頁數:49 有開題報告，任務書，

目  錄

目  錄 III
1 緒  論 1
1.1 課題研究背景與意義 1
1.1 國內外研究現狀 2
1.1.1P2P系統中的匿名性 3
1.1.2基于P2P的匿名通信機制 4
1.2 論文結構和研究內容 6
1.3 本章小結 6
2 P2P中的一種基于分組填充Mix策略的匿名通信機制 7
2.1 引  言 7
2.2 信息量分析攻擊 8
2.3 基于分組填充Mix策略的匿名通信機制 8
2.4 本章小結 9
3 NS2平臺簡介 10
3.1 NS的簡介 10
3.2 NS原理 11
3.2.1豐富的構件庫 12
3.2.2離散時間模擬器 11
3.2.3分裂對象模型 12
3.2.4開放的源代碼 13
3.3 NS的一般過程 13
3.4 本章小結 14
4 模擬與分析 15
4.1 基于分組填充Mix節點模擬 15
4.1.1Mix基本模型 15
4.1.2模擬過程及結果 15
4.1.3模擬總結 22
4.2 基于P2P的Mix網絡通信模擬 22
4.2.1基于P2P的Mix網絡模型 22
4.2.2模擬過程及結果 23
 4.2.3模擬總結 27
4.3 本章小結 27
結  論 28
致  謝 29
參考文獻 30
附錄A：Mix_Simulation_Result 32
附錄B：部分模擬代碼 36
附錄C：模擬程序環境搭建說明 44

摘    要
 隨著計算機網絡的日益普及以及因特網的迅速發展,網絡已經廣泛應用到了個人,團體和政府部門之間的通信。網絡安全和隱私通信日漸受到人們的關注和重視，許多因特網應用都需要匿名支持，匿名通信的研究成為當前的一個研究熱點。為了滿足各種隱私需求，我們有必要研究匿名通信的相關技術。
 P2P網絡中主要采取重路由技術進行匿名通信，而采取重路由技術的匿名機制有Mix和洋蔥路由。Mix機制為實現匿名通信技術提供了可行的解決方案，但攻擊者仍可以在一定程度上通過流量分析來獲取通信關系。為了進一步提高Mix機制對抗信息量分析攻擊的能力，提出了分組填充的思想，并基于分組填充Mix策略給出了一種新型匿名通信機制。與傳統Mix機制相比，新的基于分組填充的Mix機制，能在有效抵御信息量分析攻擊的同時，進一步降低網絡的額外帶寬開銷。
 最后，利用NS2對基于分組填充Mix機制和基于P2P網絡的Mix網絡通信進行了模擬。
 
關鍵詞：P2P；NS2；Mix；匿名通信；分組填充

Research of the anonymous communications algorithm in P2P network

Abstract
  With the rapid progress of information technologies, computer networks have been widely used in communications among individuals, parties and governments. Concerns on security of network and privacy of communication have been grown. Anonymity needed by many applications on Internet, A research focus which become present of research of anonymous communication. We study the problems of partially connected network traffic camouflage, rerouting path selection in anonymity systems and scalar anonymity.
 The rerouting path selection is a most popular technology for P2P anonymous communication. It is usually implemented in the Mix mechanism and Onion Routing Protocol. The Mix mechanism has provided a feasible solution for the realization of anonymous communication, but to a certain degree, the attackers can still obtain the correspondence relations through traffic analysis. In order to further improve the ability of Mix mechanism to resist the traffic analysis of message volume, a kind of scheme named group padding is proposed, and based on which, a novel anonymous correspondence mechanism is designed additionally. Compared with the traditional Mix mechanism, the newly proposed Mix mechanism based on group padding scheme can resist traffic analysis of message volume effectively, and needs lower extra bandwidth simultaneously.
 Finally, utilize NS2 platform to simulate and analysis about a grouped padding Mix mechanism and the Mix network communication based on P2P.
 
Key words: P2P；NS2；Mix； anonymous communication；group padding