面向半分布式P2P系统的可靠节点交换机制

发布时间：2018-09-03 14:22

【摘要】：P2P系统中广泛使用的来源交换(PEX)技术为系统用户提供了丰富的节点资源,加快了节点交换速度,同时也带来了不可避免的安全隐患,恶意节点可以通过来源交换对正常节点的邻居列表进行污染。首先分析了现有来源交换技术存在的安全隐患,讨论了导致这些安全隐患的核心因素;其次,以来源交换的安全性分析为基础,提出了一种面向半分布式P2P系统的安全节点交换机制。该机制借鉴基于信任评估的激励技术,通过给出超级节点的信任评估方案,引入节点来源信任的概念,以节点的来源交换信任值为支撑,控制节点间的来源交换。最后,对提出机制进行了实验性能分析。实验结果表明,由于网络异构性所存在的信任值错误计算问题,所提出的交换机制虽然会导致约2.5%比例正常的节点交换失效,但可大幅度降低正常节点参与恶意节点传播和污染的情况,从而在总体上提升了P2P系统的可靠性。
[Abstract]:(PEX) technology, which is widely used in P2P system, provides abundant node resources for system users, accelerates the speed of node exchange, and brings about inevitable security risks at the same time. Malicious nodes can corrupt the list of neighbors of normal nodes by source exchange. Firstly, this paper analyzes the hidden security problems existing in the existing source switching technology, and discusses the core factors that lead to these security risks; secondly, based on the security analysis of the source exchange, A secure node switching mechanism for semi-distributed P2P systems is proposed. Based on the incentive technology based on trust assessment, this mechanism introduces the concept of node source trust and controls the source exchange between nodes by giving a trust evaluation scheme for super nodes. Finally, the experimental performance of the proposed mechanism is analyzed. The experimental results show that because of the miscalculation of trust value due to the heterogeneity of the network, the proposed switching mechanism will lead to the failure of about 2.5% of the normal node switching. However, it can greatly reduce the situation of normal nodes participating in malicious node propagation and pollution, thus improving the reliability of P2P system as a whole.
【作者单位】：北京工业大学计算机学院;
【基金】：北京自然科学基金面上项目(4122012) 北京工业大学博士启动基金资助项目(00700054R1764) 北京市属市管高等学校人才强教深化计划项目
【分类号】：TP393.02

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