Abstract

It is very important in theory and application to evaluate credibility of trust model. Although many application models are carefully analyzed, designed and implemented, there exist some faults yet. In this paper we studied trust relationship of agents, proposed a credibility calculation model among entities and gave their complete calculation method. It considered dynamic changes of trust relationship and focused on dynamic updating strategy of credibility. In course of calculation cross chain of trust was simplified reasonably by defining and processing associated chain of trust. When carrying on updating calculation of recommendation trust, it considered not only present evaluation result but also historical evaluation records and made evaluation system more rational. A dynamic access control algorithm based on credibility was also present. It enhanced flexibility of mobile process and availability of network security facility. In end of this paper, an experiment on direct trust relationship and recommendation trust relationship among agents was carried on. Experiment results showed that after some circle calculations trust relationships among agents reached a stable state and the credibility calculation model was feasible.

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