Authorization control in collaborative healthcare systems
Journal of Theoretical and Applied Electronic Commerce Research
Access control: what is required in business collaboration?
ADC '09 Proceedings of the Twentieth Australasian Conference on Australasian Database - Volume 92
A self-policing policy language
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
ShareAlike your data: self-referential usage policies for the semantic web
ISWC'11 Proceedings of the 10th international conference on The semantic web - Volume Part I
Datalog for security, privacy and trust
Datalog'10 Proceedings of the First international conference on Datalog Reloaded
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Policy comparison is useful for a variety of applications, including policy validation and policy-aware service selection. While policy comparison is somewhat natural for policy languages based on description logics, it becomes rather difficult for rule-based policies. When policies have recursive rules, the problem is in general undecidable. Still most policies require some form of recursion to model-say-subject and object hierarchies, and certificate chains. In this paper, we show how policies with recursion can be compared by adapting query optimization techniques developed for the relational algebra. We prove soundness and completeness of our method, discuss the compatibility of the restrictive assumptions we need w.r.t. our reference application scenarios, and report the results of a preliminary set of experiments to prove the practical applicability of our approach.