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Demand for management of trust in networked systems introduces more complexity
than ever when federation activities become pervasive. Many existing research efforts
have focused on different aspects of trust management, and they use different criteria
and metrics to evaluate their efforts. These criteria and metrics are often applicable only
to the researchers' own systems. This paper briefly examines general requirements for
federated trust management and a number of existing systems from different aspects,
and uses a set of evaluation metrics to comprehensively compare these trust
management systems. Using this set of network connection configuration, a system's merits and weaknesses can
be more clearly documented for system users and researchers. To illustrate the
applicability, the metrics are applied to the comparisons between trust management
systems from leading technology companies such as IBM, AT&T, and other extant trust
management systems from the research community. However, the metrics introduced in
this paper are not ultimate results; rather, they are intended to initiate a broader
discussion of what is needed, and to offer a context in which to evaluate current and
future solutions and to inspire new directions for federated trust management.
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