| P2P network with its non-center, high scalability, robustness, cost-effective and good load-balancing and other features become the focus of computer networks research. Compared with traditional distributed systems, P2P technology has unmatched technical superiority and broad application of market prospects, but because of P2P network of open, dynamic and anonymity features, leading to the risk of the transaction between the nodes become more traditional centralized type network greatly increased, which led to the security of information resources and data become very important, and security issues in network technology has been in an unfavorable situation, and not yet fully solved. The current main security technologies, including encryption, digital signatures, access control, intrusion detection and trust management. In this case, to establish effective mechanisms for trust management in the P2P networks is very importance. Study of trust in P2P network management system not only for research and promotion of P2P networks have a good theoretical significance, drawing on other P2P network technology research to develop ideas, divergent thinking, etc. have a good guide; while trust management research can be used for security protocol analysis, and can be combined with encryption technology and research to guide the application of the new security mechanisms for application-level on the development of trading rules and trading strategies provide practical solutions to protect the security of transactions on the Internet, reducing the risk of certain transactions, to combat and prevent criminal behavior of some online have a good sense. In recent years there have been various types of trust management model for P2P network security, but the majority against a trust management model considered one aspect or part of the process factors, such as for selecting chain of trust, indirect trust value calculation. In this paper, in order to solve the transaction chain issues and recommendation of trust, put forward the proposed transaction time interval of a trust management model. This model based on the Reputation-based trust model, for a given time interval as the main factor in the calculation of Measure of trust, while the recommended screening in the chain as a binary number with variable weights. For nodes direct trade transactions considered to be the most recent evaluation of the value of information, and recommended an integrated transaction trust value is calculated, excluding time requirements that not meet the recommended chain, making the trust value is calculated with good timeliness.In this paper, we first to analysis a reputation-based trust management model for the related theoretical. Reputation-based trust management model drawing on the concept of human social reputation, put forward the P2P network "reputation" concept, that is between the nodes in the P2P network behavior based on past performance will take place on an evaluation of the transaction. This model follows the rules related to human sociology, according to the factors affecting the credibility of the derivation and calculation of trust values. In human society there has a strong reputation in the subjective, in the evaluation and delivery time are vulnerable to outside interference; in the P2P network, all of the trusted computing are objective data-level terms, very little additional personal subjective, in which there is a trust which is passed on the question, how to solve the P2P network to pass——recommended issue of trust has become an important object of study.Second, we consider the time factor in the trust management model play an important role. As time changes, the impact of the current trust assessment that in accordance with historical behavior of the node will gradually become smaller is an element of the study recognized. Now considered the time factor in the study of trust management model for the status is:1) The trust value is a function of decay over time, The more time near the trade assessment, trust values more credible; the contrary, the trust value is not credible;2) Trust value update at set intervals. in the early most trust management used this approach, then the recent update policy change direction immediate update method of combining regularly update approaches.According to the analysis we propose a trust management model, which gives a time interval as the main factor in the calculation. Use the recently evaluation to calculate the direct trust value, the node that has been transaction ensure the trustworthiness subjectively. But the node to maintain the resource classification, trust value and other factors over time, the timeliness of direct trust value has changed. Recommended transaction is the computation of a composite trust value, including the recommended node direct and indirect trading transactions, to avoid the trust value of the deviation. Recommended the selection of chain to use change decimal as a weight value, due to different chain of recommendations arising from the trust weights vary.In the last of this article we summarize the malicious nodes identification. Review the main features of the malicious nodes in the P2P network, the identification of malicious nodes, penalties and other problems in this stage. |
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