关键词: 信任管理, 主观信任, 信任类型, 可信性测度, 模糊变量

Abstract: Through discussing the evaluation methods of subjective trust in open network，a new approach of subjective trust evaluation based on credibility theory is presented with considerations of the fuzzy nature of the subjective trust.And then under the situations that the key attributes of subjects are characterized as fuzzy variables，a simulation technique is given to calculate the credibility of the subjective trust.The example indicates that the presented approach is feasible and effectual for valuing the subjective trust in open network.

Key words: trust management, subjective trust, trust class, credibility measure, fuzzy variable