Research On Reputation Models Of The Peer-To-Peer Networks

With the developing technology of network, enriching resource of consumer node system and increasing bandwidth of network, the problems brought by servers' function obstacle and nodes' losing efficiency in traditional Client/Server model not only restrict us to make the best of consumer node's resource but also cannot meet the need of distributed pattern. And the advantage shown at the collaboration, distributed information communion, large-scale parallel computing in Peer-to-Peer (P2P) network is so particular that it becomes a developmental hot point.Although there is a lot of advantage in P2P network compared with traditional C/S network, its distributed structure and nonconcentrated management also bring some questions to itself. Such as it is difficult to administer or control the whole network, and many application procedures have faint ability to dominate P2P equipments, it is easily to plunge the net into disordered state. At the same time, the problems of some security strategies are resulted in the altitude autonomous rule and dynamic manner of P2P. Especially, there are lots of cheating behaviors, unreliable quality of service and low usability of network. We usually believe that large-scale website, as eBay, is safe in practice, but in the P2P network, things are not like that. The shareable resource is provided by a complete unknown node which land the network freely and anonymously in the P2P, so it is hard to know the node is vicious or not, whether to be controlled, and therefore it is necessarily to make a reputation system to manage the P2P network.The research of reputation model began at last century 90s. The algorithm is hard to realize in the P2P because of complicated model in reputation system and strict demand for free consumers, and the study is rested on theory and cannot be spread. The thesis has set up a reputation model system based on power-law. This model makes fully use of the past experience of node itself and builds reputation relation between two interactional nodes, so it is effectively to solve the problem of lack trust in P2P network. Furthermore, this algorithm is compactly and more useful when apply it in real network, and this model can enhance P2P's usability and make it more sampler and trustable. Follow then, how to build the reputation system in P2P network is studied, and we also discuss the problem that we meet and explain the process of building the reputation system.