关键词: P2P网络 DHT 并发下载 恶意节点

Abstract:

This paper studies the concurrent downloading technologies and implements the mechanism of concurrent downloading based on the Chord algorithm. A numb er 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 faul t 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.

Key words: peer-to-peer network, distributed hash table, concurrent downloading ;malicious node