DHT网络中并发下载及安全防御机制的实现  

Implementation of the Concurrent Downloading and Security Defense Mechanism in the DHT-Based Network

作　　者：宁晓莉 黄遵国[1] 

机构地区：[1]国防科技大学计算机学院,湖南长沙410073

出　　处：《计算机工程与科学》2008年第1期12-17,21,共7页Computer Engineering & Science

基　　金：国家863计划资助项目(2003AA142080)

摘　　要：本文对并发下载技术进行了研究,并在此基础上实现了基于Chord算法的并发下载机制。现在,大多数结构化P2P网络都构建于基于DHT的覆盖式网络之上。文中分析了DHT算法的基本原理、特点和结构,研究了Chord算法在P2P通信、系统稳定性和容错性保障等方面所起的关键作用。所实现的下载机制能够适应大量节点的并发下载请求,并且有效地解决了基于DHT算法的大规模P2P系统所固有的一些安全问题,特别是网络中节点之间的信任问题,在即使有恶意节点参与的情况下仍能够保证系统正常运行,从而使得系统的生存能力得到显著增强。This paper studies the concurrent downloading technologies and implements the mechanism of concurrent downloading based on the Chord algorithm. A number of recent structured P2P systems are built on top of the DHT-based P2P overlay networks. The paper analyzes the basic principle, characteristics and the structure of the DHT algorithms, and discusses the Chord algorithm which plays an important rolein the P2P communications,and the stability and fault tolerance of the system. The mechanism of downloading in the paper can adapt to the concurrent downloading requests of thousands of peers, and it has effective solutions to some security problems which are inherent in large-scale P2P systems based on the DHT algorithm, especially the trust problem between the participating peers in the P2P networks. The system provides assurance on good performance even though some participants are malicious. So the survivability of the system is improved remarkably.

关 键 词：P2P网络 DHT 并发下载 恶意节点 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]