Abstract: Based on existing research about classification of trust, the inaccuracy of trust classification for web services is analyzed and plan for classifying trust dynamically is put forward. From the angle of rationality and flexibility of defining trust attributes, intuitionistic fuzzy number is used to describe trust signature. Inherent capability, security characteristic and reputation are considered as the main signature to describe trust. Contribution degree of Inherent capability, security characteristic and reputation are calculated. Similarity matrix of trust intuitionistic fuzzy sets is constructed. Intuitionistic fuzzy equivalent matrix is got by calculating transitive closure. And trust classification is obtained by defining threshold cutting matrix. Validity and accuracy of dynamic classification is verified.

Key words: Intuitionistic fuzzy sets, Classification of trust, Web service, Membership degree, Security

摘要： 在已有的信任类型研究的基础上，分析了针对Web服务的信任分类的不准确性问题，提出了动态定义信任类别的方案。从定义Web服务的信任属性的合理性和灵活性角度出发，提出用直觉模糊数描述信任特征，考虑固有能力、安全特性和声誉三个方面的特征对信任的影响,并给出能力信任贡献度、安全信任贡献度和声誉信任贡献度的计算方法。构造了信任直觉模糊集的相似矩阵，由求传递闭包的方式得到直觉模糊等价矩阵，通过设定不同的阈值得到不同的阈值截矩阵，从而得到不同的分类结果。验证了动态定义信任类别的有效性和准确性。

关键词: 直觉模糊集, 信任类型, Web服务, 隶属度, 安全性