document: Trust-serv : model-driven lifecycle management of trust negotiation policies for web services A scalable approach to trust negotiation is required in Web service environments that have large and dynamic requester populations . We introduce Trust-Serv , a model-driven trust negotiation framework for Web services . The framework employs a model for trust negotiation that is based on state machines , extended with security abstractions . Our policy model supports lifecycle management , an important trait in the dynamic environments that characterize Web services . In particular , we provide a set of change operations to modify policies , and migration strategies that permit ongoing negotiations to be migrated to new policies without being disrupted . Experimental results show the performance benefit of these strategies . The proposed approach has been implemented as a container-centric mechanism that is transparent to the Web services and to the developers of Web services , simplifying Web service development and management as well as enabling scalable deployments .
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