基于D-S证据理论的多维度信任评估方法

Multi-Dimensional Trust Evaluation Method Based on D-S Evidence Theory

针对当前云环境下信任评估存在的多维属性和不确定性问题,提出一个基于D-S证据理论的多维度信任评估方法,来评估云服务商的信任值。实体间的信任关系用信任、不信任和不确定来表示,依据与云服务商相关的属性证据进行直接信任度计算;并根据第三方用户的推荐计算间接信任度;最后综合直接信任和推荐信任得到云服务商的综合信任值。实验分析表明,该信任模型能够较为准确的对云服务商做出信任评估,从而有效地防止恶意攻击行为;同时将D-S证据理论引入到实体的直接信任度评估中,较好地解决了证据不确定性的问题。

A multi-dimensional trust evaluation method based on D-S evidence theory is proposed to evaluate the trust valueof cloud service provider in view of the multi-dimensional attributes and uncertainties of trust assessment in the current cloud envi-ronment. The trust relationship between entities is divided into trust,distrust,and uncertain,and the trustworthiness is calculatedbased on the attribute evidence associated with the cloud service provider. According to the recommendations of third-party entitiesto calculate indirect trust,and finally direct trust and recommended trust are integrated to assess the entity’s comprehensive trust.The analysis of experiment shows that the trust model can be more accurate to make a trust evaluation,so as to effectively preventmalicious attacks. At the same time,the D-S evidence theory is introduced into the direct trust evaluation of the entity,whichsolves the problem of uncertainty.