一种基于D-S证据理论的QoS可信度评估方法

A method of QoS trustworthiness evaluation based on D-S evidence theory

摘要:

为识别虚假QoS信息并识别Web服务间的共谋欺骗行为,提出了一种基于D-S证据理论的QoS可信度评估方法．该方法从公共信任(即基于服务间的历史交互记录)和私有信任(即基于服务自身交互经验)两方面评估QoS可信度,量化QoS信息,并以此判定QoS真实性,揭露和辟除Web服务间的共谋欺骗行为．仿真实验表明:该方法随着Web服务交互次数的增加,可信服务请求成功率也逐步上升,且要高于基于用户反馈的方法(即无法识别虚假、恶意服务的传统方法)．实验结果初步验证了该方法的可行性和有效性．

Abstract:

To identify the false QoS information and the complicity fraud between Web services, the paper adopts a QoS trust evaluation approach based on D-S evidence theory. This approach quantifies QoS information from both the public and private trust perspectives, which can determine the trustiness of Web services and identify the complicity fraud between the Web services. Preliminary simulation experiments show that, when the interactions between Web services increase, the approach can increase the success rate of trusted Web services, which is higher than the normal approach used before (which cannot identify false QoS information). The result supports the feasibility and effectiveness of the approach, prepares for the next large-scale empirical study.