Requirements of federated trust management for service-oriented architectures

Trust management plays a critical role to smooth collaboration among component services from different trust domains and information sharing between trust domains. The federation of these component services makes new demands for managing trust-related behavior. Although many extant trust management systems deal with intra-domain trust behaviors, there is a growing need for effective strategies for managing inter-domain behaviors. In this paper we explore requirements for a federated trust management system from four aspects, and then examine a set of suitable criteria for evaluation of such a system. The purpose of this paper is not to suggest a complete set of evaluation metrics covering all necessary features; instead, its purpose is to initiate a discussion and to offer a context in which to evaluate current and future solutions, in order to encourage the development of proper models and systems for federated trust management.