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Ruohomma and Kutvonen [1] discuss the requirements of a trust management system
from the viewpoint of trust's life cycle, which include initialization of a trust
relationship, observation of the relationship, and actions caused by the relationship.
But that is not enough. Wu and Weaver [2] discussed a set of more comprehensive
requirements for federated trust management systems. Following this discussion, this
section briefly examines the requirements of trust management systems from four
different aspects from both fundamental and practical viewpoints. Fulfillment of these
requirements will not only provide solid support of the functionalities for trust
network design management proposed by Ruohomma and Kutvonen, but also support new
requirements unique from federation activities and federated trust management. Trust
representation, trust exchange, trust establishment, and trust enforcement are the four
crucial aspects of which a federated trust management system needs to take care.
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