Abstract:

In order to solve some trust-related security problems existing in curent Web service networks and im-prove the security and reliability of W eb services,this paper proposes an improved adaptive trust model of Web services,namely,iWSTrust,and the coresponding evaluation algorithms of its trustworthiness an d 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 inform ation.Th en,by considering the related entities in the Web service environment,the trust relationships involved in a typical interaction are analyzed.Moreover,diferent types of service requesters are distinguished,which enables the trustworthiness and reputation of entities to self-adapt with the increase of interaction experience.Th e results of simulated experiments show that iW STrust ,to some extent,can decrease the number of accessing vicious entities and punish deceitful entities accordingly.

Key words: Web service, trust model, subjective logic, service broker, service provider, service requeste