基于主观逻辑的Web服务信任模型

A Trust Model of Web Services Based on Subjective Logic

为解决当前Web服务网络中存在的一些与信任相关的安全问题、提高Web服务的安全性和可靠性,基于主观逻辑,文中提出了一个改进的自适应Web服务信任模型iWSTrust及相应的信任度和声誉评估算法.该模型利用主观逻辑对Web服务网络中的实体进行信任建模和推理,并增加可信任的第三方机构来保存信任信息,通过综合考虑Web服务环境中的各个相关实体,分析一次典型交易过程中所涉及的信任关系,并对不同类型的服务请求者进行区分,使得实体的信任度和声誉能够随着交易经验的增加而自适应地改变。模拟实验结果表明,iWSTrust能在一定程度上减少访问到恶意实体的次数, 并惩罚进行欺骗的实体.

In order to solve some trust-related security problems existing in current Web service networks and improve the security and reliability of Web services, this paper proposes an improved adaptive trust model of Web services, namely, iWSTrust, and the corresponding evaluation algorithms of its trustworthiness and reputation. In iWSTrust, the subjective logic is first used to model and reason the trust for the entries in Web service networks, and a trusty third party is added to store the trust information. Then, by considering the related entities in the Web service environment, the trust relationships involved in a typical interaction are analyzed. Moreover, different types of service requesters are distinguished, which enables the trustworthiness and reputation of entities to self-adapt with the increase of interaction experience. The results of simulated experiments show that iWSTrust, to some extent, can decrease the number of accessing vicious entities and nunish deceitful entities accordingly.