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Published in:
2012 | OriginalPaper | Chapter
The Semantics of Role-Based Trust Management Languages
Authors : Anna Felkner, Krzysztof Sacha
Published in: Advances in Software Engineering Techniques
Publisher: Springer Berlin Heidelberg
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Role-based Trust management (RT) languages are used for representing policies and credentials in decentralized, distributed access control systems. RT languages combine trust management and role-based access control features. A credential provides information about the keys, rights and qualifications from one or more trusted authorities. The paper presents a set-theoretic semantics of Role-based Trust management languages, which maps a role to a set of sets of entity names. The semantics applies not only to the basic language of the family
RT
0
, but also to a much more sophisticated
RT
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, which provides manifold roles and role-product operators to express threshold and separation-of-duty policies. A manifold role defines sets of entities whose cooperation satisfies the manifold role. It enables to express a such a condition, which need more than one member of a role to effectively fulfill the particular task.