BitTorrent内容污染防御技术研究

Research on Anti-pollution Mechanism of BitTorrent Content

主要研究了内容污染原理、主要技术方法和防范内容污染的客户端防御机制及其防御策略改进。首先分析了BitTorrent下载原理和网络结构,对BitTorrent内容污染的主要原理以及作为内容污染前提条件的多种索引污染方法进行了研究,并详细分析了当前存在的几种内容污染手段和策略。然后进一步研究了客户端对抗内容污染的具体防御行为和整体防御机制,针对性设计并实现了若干改进的防御策略和具体算法。最后通过内容污染防御实验予以验证。

This paper mostly studies the principle, main technology and methods of content pollution, and defense mechanisms against pollution and improved.defense strategies. Firstly it analyzes the downloading principle and network structure of BitTorrent, studies the principle of content pollution and various index polluting methods. It includes a detailed analysis of several content polluting strategies, spe- cific defensive behaviors and overall defense mechanisms. Then it designs and implements several improved defensive strategies and algo.- rithms which can lead to security improvements in clients. Finally, it validates the effectiveness of improved defense mechanism with some experiments on preventing content pollution.