In view of the characteristics of Web environment and Web service, capability, security and reputation are imported as trust attributes for Web service to generate trust degrees. Membership degree, non-membership degree and intuitionistic index are used to describe trust attributes. Calculation formulas of trust contribution degree of capability, security and reputation are proposed. On the basis of intuitionistic fuzzy clustering, a dynamic classification method of trust is put forward. Simulation results show that trust attributes described by intuitionistic fuzzy numbers are more close to real environment, and dynamic classification of trust based on intuitionistic fuzzy clustering generate effective and reasonable classification results.
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