共查询到19条相似文献,搜索用时 109 毫秒
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基于P2P的分布式工作流平台 总被引:1,自引:1,他引:1
随着跨组织业务的拓展,分布式工作流已经成为研究热点。通过对分布式工作流和P2P技术的分析,提出了一种基于P2P的分布式工作流平台。描述了它的网络架构和系统架构,建立了底层的消息通信机制,给出了工作流的定义和执行的分布式设计。相对于传统的工作流平台而言,该平台具有可靠性高、异步协同能力强和应用广泛的特点。 相似文献
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P2P文件共享系统中的分组信誉驱动机制 总被引:1,自引:0,他引:1
在P2P文件共享系统中,常会出现许多有策略的欺骗行为,而现有的信任模型并不能完全消除交易的风险。综合局部信任机制和全局信任机制,根据节点间相关的共享记录数据提出一种新的信誉计算方法,并进一步提出受信誉驱动的分组组织管理和节点搜索算法。仿真结果证明该信誉驱动机制能搜索到信誉值高的节点作为交易对象,并能有效降低系统面对合谋恶意节点和具有交易策略的恶意节点攻击时的交易风险。 相似文献
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以结构化的DHT P2P网络作为分布式平台,探讨一种P2P数据库的数据索引和定位机制。我们主要使用数据复制和分层索引机制来保证高效的实现资源定位,并且避免了Hash对数据语义的破坏,使系统有效的保持数据语义间的联系。 相似文献
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基于P2P技术的Gnutella网络搜索路由机制的改进 总被引:2,自引:0,他引:2
介绍了分布式P2P网络Gnutella模型消息搜索路由机制,在分析其存在大量冗余数据包传输问题的基础上,提出了一种基于分布式存储路由信息的搜索路由机制的改进策略,能有效地提高网络可扩展性和减少消息冗余。 相似文献
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在网络中搜索各种教育资源时,通用的搜索引擎很难满足特定的需求。P2P网络是一种有效的资源共享和搜索方式。通过分析P2P网络的基本结构和资源共享特点,提出了一种基于P2P的教育资源网络(PBERN)模型。PBERN是由教育资源实体“自组织”组成的分布式、虚拟、动态和松散的纯P2P网络。 相似文献
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以结构化的DHT P2P网络作为分布式平台,探讨一种P2P数据库的数据索引和定位机制.我们主要使用数据复制和分层索引机制来保证高效的实现资源定位,并且避免了Hash对数据语义的破坏,使系统有效的保持数据语义间的联系. 相似文献
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虽然传统的信誉机制可以有效激励P2P网络中的节点共享资源,但却带来女巫攻击和共谋攻击等安全问题,而现有的抵御这两种团体欺骗的方法往往没有考虑P2P网络的开放性,即鼓励节点的加入.本文从分析P2P信任网络(基于信任网络的P2P系统)的社团结构出发,根据节点之间的信任关系将网络划分成不同的信任团体,提出一种基于团体信任度的节点信誉机制.模拟实验结果表明:在不限制团体大小以及新节点加入的情况下,该机制可以有效地抵御开放P2P网络中的团体欺骗. 相似文献
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网络信誉系统是一个用于综合运算、记录并发布各个客户端以往行为表现的系统。在P2P开放网络资源共享系统中,网络信誉系统起到了两个重要的作用:向用户提供信息以决定对方是否可信,激励交易双方在交易中保持良好的表现以提高自身的信誉度。该文介绍了P2P开放网络与信誉管理系统的概念,分析了现有的信誉系统、模型及其算法。在此基础上设计了新的模型,该模型以信任链方式查询节点信誉度,提出把信誉度分层的方法,通过Java实现了该系统,展望了网络信誉系统的发展方向。 相似文献
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提出一种安全结构化对等网络的节点信誉管理机制。使用全局储存方式保存信誉度信息,将文件信誉与节点信誉相结合,避免恶意节点通过修改标识符伪装友好节点的行为。对文件共享系统中的基本操作过程进行分析。在各种节点行为下进行模拟实验,结果证明了该信誉管理机制的有效性。 相似文献
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In recent years, the demand for multimedia streaming over the Internet is soaring. Due to the lack of a centralized point of administration, Peer-to-Peer (P2P) streaming systems are vulnerable to pollution attacks, in which video segments might be altered by any peer before being shared. Among existing proposals, reputation-based defense mechanisms are the most effective and practical solutions. We performed a measurement study on the effectiveness of this class of solutions. We implemented a framework that allows us to simulate different variations of the reputation rating systems, from the centralized global approaches to the decentralized local approaches, under different parameter settings and pollution models. One key finding is that a centralized reputation system is only effective in static network and in defending against light pollution attacks. In general, a fully distributed reputation system is more suitable for the “real-time” P2P streaming system, since it is better in handling network dynamics and fast in detecting the polluters. Based on this key finding, we propose DRank, a fully distributed rank-based reputation system. Experimental results show that this technique is more flexible and robust in fighting pollution attacks. 相似文献
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对等网技术(P2P)已经在分布式计算系统中获得了广泛的应用,数字城市中的服务本质上也是对等的。本文提出基于P2P模式的数字城市服务管理系统,并对平台设计、实现进行了探讨。 相似文献
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Characterizing Economic and Social Properties of Trust and Reputation Systems in P2P Environment 总被引:2,自引:0,他引:2 下载免费PDF全文
Considering the fact that P2P (Peer-to-Peer) systems are self-organized and autonomous, social-control mechanism (like trust and reputation) is essential to evaluate the trustworthiness of participating peers and to combat the selfish, dishonest and malicious peer behaviors. So, naturally, we advocate that P2P systems that gradually act as an important information infrastructure should be multi-disciplinary research topic, and reflect certain features of our society. So, from economic and social perspective, this paper designs the incentive-compatible reputation feedback scheme based on well-known economic model, and characterizes the social features of trust network in terms of efficiency and cost. Specifically, our framework has two distinctive purposes: first, from high-level perspective, we argue trust system is a special kind of social network, and an accurate characterization of the structural properties of the network can be of fundamental importance to understand the dynamics of the system. Thus, inspired by the concept of weighted small-world, this paper proposes new measurements to characterize the social properties of trust system, that is, high global and local efficiency, and low cost; then, from relative low-level perspective, we argue that reputation feedback is a special kind of information, and it is not free. So, based on economic model, VCG (Vickrey-Clarke-Grove)-like reputation remuneration mechanism is proposed to stimulate rational peers not only to provide reputation feedback, but truthfully offer feedback. Furthermore, considering that trust and reputation is subjective, we classify the trust into functional trust and referral trust, and extend the referral trust to include two factors: similarity and truthfulness, which can efficiently reduce the trust inference error. The preliminary simulation results show the benefits of our proposal and the emergence of certain social properties in trust network. 相似文献