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Research on Trust Mechanism of Grid Services

Author: DongXiaoHua
Tutor: WuZhongFu
School: Chongqing University
Course: Applied Computer Technology
Keywords: Grid Service Trust mechanism Credit Similarity Reparation
CLC: TP393.08
Type: PhD thesis
Year: 2010
Downloads: 321
Quote: 0
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Abstract


WSRF-based grid platform packed multi-institutional virtual organizations in a variety of computing resources in a unified form of services provided to outside users, multi-institutional virtual organizations or dynamic resource sharing and collaboration problems, make the grid to form an open, publicly accessible and dynamic cooperative service model changes. Grid quality of service QoS and trusted by the performance of QoS constraints, including the final length of service QoS performance and time-related parameters, etc., and precision and accuracy of the related parameters; the trust service QoS information is used to evaluate the true available letters degree. However, in the current grid services, the majority of QoS-based management only consider the performance QoS, ignoring the impact of QoS trust, or trust only consider QoS while ignoring the performance QoS. The traditional grid security mechanisms (cryptographic protocols and authorization) can make grid services from malicious damage, but can not solve the lack of trust caused by malicious behavior. Therefore, performance guarantees QoS requirements while taking into account the QoS requirements of trust, the formation of trust mechanism can be integrated into grid service management strategy is an important research topic. This paper focuses on how to establish an effective grid service trust evaluation model, fully consider the impact of a variety of grid service trust evaluation factors, evaluation of grid services conduct effective supervision, improve the accuracy of trust evaluation to ensure that the grid QoS service performance and trust QoS. Its main contents are as follows: ① Global Grid service trust evaluation model. Contact grid service environment particularity trust issues, considering the grid service security policy (security credentials and policies), service capabilities and credibility of the situation, put forward a comprehensive grid service trust evaluation model - based on evidence, strategies , service capabilities and credibility of grid service global trust evaluation model GTM-CPCR, to trust in the grid service integrated assessment. And for a greater degree of confidence in the credibility of impact assessment models, analyzing the existing trust model did not consider multidimensional characteristics, proposed an integrated multi-key reputation calculation model RCM-MKF, the model should be considered in the transaction value, the user's score trust, time, weight, credibility feedback score, the recent trust and community contributions and other factors. ② trust recommendations based on similarity. The current recommendation for the trust, there is no effective way to avoid malicious recommendation problems, and proposed recommendation trust model based on similarity. By the cosine similarity and Pearson correlation coefficient method for assessing the conduct of the parties for analysis, the similarity between the two, in order to similarity as a trusted recommended weights. On this basis, for direct trust the credibility of the feedback, the credibility of proposed recommendations based on similarity model RCM-MKF-Sim. Recommended for indirect trust issue, indirect trust based on similarity calculation model, and gives the derivation of trust path algorithm. Experimental results show that the proposed model is based on similarity of trust recommended assessment can effectively avoid malicious behavior. ③ grid service based compensation trust evaluation. Confidence in the existing grid services assessment, evaluation for trust and confidence in assessment computationally intensive inaccurate two problems, propose a grid service based compensation trust evaluation model TEMC. Commitment in the market mechanism, the two sides assessed the expected return on the assessment of proposed actions and promised compensation price fails, the parties aim at maximizing their profits. According to game theory, the trust assessment, the evaluators assess reliability in unclear circumstances raised by the evaluators expected revenue and compensation rates to calculate the probability of reliability assessment information to maximize revenue based on mutual needs, The two sides come to an assessment of compensation based trading strategies. Active choice by being the evaluators assessed object, you can effectively filter out the integrity of the assessment, to improve the assessment of the accuracy and reduce the trust calculation and reduce network overhead transmission assessment information has a significant effect. ④ trust model of qualitative research. This paper presents a trust model based on qualitative, from a qualitative point of view to analyze the relationship of trust, trust relationships can be used as an important supplement, but also as a future research direction trust relationship. ⑤ scheduling grid service based on trust. The current grid service architecture, grid services and more attention focused on the problem of functional constraint service discovery, service did not fully consider the filtering and selection problems, but also provides the user does not complete the work required for adequate QoS information, can not ensure its discovery services to meet users' QoS requirements. Therefore, for different grid, proposed service discovery based on trust and trust-based GTM-CPCR_SF service call GTM-CPCR_SI. Algorithms in different application environments, the service can be effectively filtering and sorting, better than existing models to meet the demand for services by maximizing the overall quality of service, trust the QoS QoS and performance requirements.

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