节点文献
P2P文件共享系统中信誉机制研究
【作者】 叶丹霞；
【导师】 范明钰；
【作者基本信息】 电子科技大学 ， 软件工程， 2009， 硕士
【摘要】 P2P网络又称为对等网络,由于其具有诸如分布性、对等性和高扩展性等特点,受到了人们的广泛欢迎。但这种网络与以往C/S模式的网络构架相比,缺陷也很明显,特别在安全方面P2P网络面临着诸如路由安全、数据安全、病毒传播、信任关系等多个领域的问题,这些问题形式多样,表现独特,有些对网络有严重的危害性。本文以P2P网络中的文件共享领域的应用作为探讨的背景,探讨P2P安全问题。由于P2P网络节点间的相互访问往往缺乏互信,为了解决这种由于信任产生的问题,人们在P2P网络上建立了信誉机制,用以给P2P的文件共享领域带来更好的安全性。这种信誉机制通过记录和文件共享网络上节点的“行为表现”,帮助P2P网络中节点根据其“行为表现”判断其节点将来可能的行为,或者这一节点将与之交互的其他节点的行为,从而减少某些恶意节点危害的机会。一个完整的信誉机制是一个复杂的整体。最近几年的研究已经有了相当的成果,有很多的信誉机制被提了出来。然而,大多数关于信誉机制的研究相互独立,并没有将研究成果标准化和系统化,不利于后人在此基础上的进一步研究。因此,本文重点是从分析信誉机制的工作原理出发,首先剖析了信誉机制的本质,然后在实现部分详细阐述了信誉机制的设计思想,讨论了怎样在文件共享环境这样一个具体的研究背景下建立信誉机制的方法。本文的创新在于将认证和授权加入信誉机制这个整体,并在信誉机制的信誉模型部分加入改进后的信誉模型,用于实现信誉值计算的部分工作。更重要的是我们改进了大多数现有的文件共享系统的整体结构,提出了节点服务器集这种类似三层的文件共享系统结构,在这种三层结构基础上实现了信誉机制。其次,本文对一些代表性的信誉模型进行了举例,作用在于通过分析以往的这些典型的信誉模型引出我们使用一种改进后的信誉模型的思路。并通过文章后面的仿真部分进一步的验证了本文所提出模型的有效性。这些对于今后的研究和实践都有相当的参考价值。
【Abstract】 Due to its distribution, on an equal and features high scalability, P2P networks have been widely welcomed. However, this network and the previous C/S mode have also evident defect, particularly in terms of security, such as routing security, data security, the spread of the virus, a relationship of trust and other fields, these issue have diversity performance .some of them have serious harm to our system.In this paper, we use P2P file-sharing system as the background to explore the P2P security. Nodes lack of trust in their interaction, people want to establish the credibility of the mechanism in the P2P network for better security.The network use node’s "behavior" to help the P2P network node in accordance with its "behavior" may determine the future behavior, thus reducing some of the opportunities against malicious nodes.A complete mechanism is a complex whole mode. In recent years, many mechanisms have been put forward. However, most research independent of each other, and not have standardized and systematic which not conducive to future study. Therefore, this article focuses on the credibility of the mechanism, firstly, from the analysis of the working principle, the analysis of the nature of the credibility of the mechanism, and then in the realization of some of the credibility of the mechanism described in detail the design ideas, to discuss how to file-sharing environment in a context of specific research mechanisms to establish credibility. In this paper, innovation is the authentication and authorization mechanisms by adding the credibility of the whole mechanism in the credibility of some of the credibility of the model by adding the credibility of the improved model for the realization of some of the credibility of the work value. More importantly, the majority of us to improve our existing file-sharing system, the overall structure of such a node server set the file-sharing similar three-tier system architecture, in which three-tier architecture based on the credibility of the mechanism. Secondly, this paper, the credibility of the representation of some model, for example, is the role of the past through the analysis of the credibility of these models we use a model leads to the credibility of the model improved the ideas. The article followed by a further part of the simulation verifies the effectiveness of the proposed model. These for future research and practice have considerable reference value.