结构化P2P网络上的可靠查询服务

发布时间：2018-04-11 10:43

本文选题：P2P + 可靠查询服务　；参考：《西安电子科技大学》2014年硕士论文

【摘要】：结构化对等网络（Peer-to-Peer，P2P）是目前计算机网络技术的研究热点，在文件共享、分布式文件系统、社交网络等方向有着巨大应用的潜力。查询服务是结构化P2P网络的核心技术，它的可靠性是系统能够正常工作的基础。结构化P2P网络天然具有无中心节点的特点，节点的加入和退出无法统一管理，难以防止恶意节点进入网络，因而难以保证网络的可信性。同时，由于每个节点仅保存少量的路由信息，查询服务需要依赖网络中的其他节点获取网络信息，使得不可信P2P网络上的查询服务容易受到恶意节点的干扰。本文分析DHT高可靠定位服务（High-Assurance Locate for Distributed Hash Tables, Halo），并针对其存在的弱点提出改进机制。在此基础上，提出一种基于信任中心（TrustedAuthority,TA）的攻击检测机制，用于发现网络中的恶意节点。针对结构化P2P网络中查询服务存在的问题，本文主要基于冗余查询和主动探测，研究了结构化P2P网络中的可靠查询服务，具体如下： (1) Halo通过询问网络中多个可能持有所需路由信息的节点来确定查询结果，这一机制的可靠性很大程度依赖于被询问节点上路由信息的正确性。本文通过实际仿真，对比不同的节点加入策略对Halo的影响，并提出改进措施； (2)在可靠查询服务的基础上，为了更有效的限制网络中恶意节点的主动攻击行为，本文提出一种基于信任中心的攻击检测机制。使用这一机制可以有效地识别恶意节点，并且只占用很少的网络和CPU资源。
[Abstract]:Structured Peer-to-PeerP (Peer-to-PeerP) is a hot topic in computer network technology. It has great application potential in file sharing, distributed file system, social network and so on.Query service is the core technology of structured P2P network, and its reliability is the basis for the system to work properly.Structured P2P networks naturally have the characteristics of no central nodes, the join and exit of nodes can not be unified management, it is difficult to prevent malicious nodes from entering the network, so it is difficult to ensure the credibility of the network.At the same time, because each node only keeps a small amount of routing information, the query service needs to rely on other nodes in the network to obtain network information, which makes the query service on the untrusted P2P network vulnerable to the interference of malicious nodes.This paper analyzes High-Assurance Locate for Distributed Hash Tables (Haloa), DHT high reliability positioning service, and proposes an improved mechanism for its weakness.On this basis, an attack detection mechanism based on trust center trusted AuthorityTAis is proposed to detect malicious nodes in the network.Aiming at the problem of query service in structured P2P network, based on redundant query and active detection, the reliable query service in structured P2P network is studied in this paper, as follows:1) Halo determines the result of the query by interrogating multiple nodes in the network that may hold the required routing information. The reliability of this mechanism depends largely on the correctness of the routing information on the node being questioned.In this paper, the effect of different node joining strategies on Halo is compared through actual simulation, and the improvement measures are put forward.On the basis of reliable query service, in order to restrict the active attack behavior of malicious nodes in the network more effectively, this paper proposes an attack detection mechanism based on trust center.Using this mechanism, malicious nodes can be effectively identified, and only a small amount of network and CPU resources are consumed.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.02

【相似文献】