Peer-to-Peer (P2P) has attracted a great deal of interest in industry and research literature. Peer-to-peer information systems (P2PIS) are Internet-based systems for distributed data management that operate in a completely decentralized manner, aiming at unlimited scalability with millions of nodes, continuous availability regardless of node and network failures, self-stabilization in the presence of rapidly evolving participation of nodes and potentially selfish node behavior, and high robustness with respect to denial-of-service attacks and other traffic anomalies. P2PIS have become popular with file-sharing applications like Napster, Gnutella, KaZaA, etc. In this paper, we analysed the requirements of P2P shared information system, and then discussed the key technology for implementation of p2p information sharing system, finally analysed some applications of p2p information sharing system.
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