Abstract: In order to deal with the problem of the decline of accuracy of trust metric, which is met due to the ignorance of the difference of rating scale, we presented a new trust metric based on fuzzy adjustment, Firstly, we described the semantic of trust rating and rating scale based on fuzzy member functions. On this basis,we proposed a trust rating adjust method. Lastly, we applied the weigh calculated from similarity matrix to trust aggregation. Analysis and experiment show that compared with Pagerank algorithm and TidalTrust algorithm, the method proposed in this paper has more remarkable enhancements in the accuracy of trust metric and is effective to reduce the false positive and negative in trust decision.

Key words: Rating scale,Trust value adiustment,Trust aggreation,Trust metric