Research on service trust evaluation approach under cloud computing environment

In cloud computing, the resources of service are widely distributed, complex and fickle. The trust relationship between service entities is hard to establish and maintain with high uncertainty. The characteristics of randomness and fuzziness of services could not be responded by traditional trust evaluation approach comprehensively, a service trust evaluation method based on weighted multi-attribute cloud was proposed. Time decay factor was introduced to reflect the timeliness of trust,and multi-attribute trust cloud was used to refine the evaluation granularity. In order to prevent conspiracy to defraud and malicious attacks, the reliability and weight of recommender were confirmed by similarity of evaluation. The trust rating could be confirmed by cloud similarity calculation, which could provide security decisions for the user´s services selection. Simulation results show that this method can improve the success rate of services interaction obviously, and be applied to service trust evaluation under cloud computing environment.