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Access control is central to security in computer systems. Over the years, there have been many efforts to explain and to improve access control, sometimes with logical ideas and tools. This paper is a partial survey and discussion of the role of logic in access control. It considers logical foundations for access control and their applications, in particular in languages for security policies. It focuses on some specific logics and their properties. It is intended as a written counterpart to a tutorial given at the 2009 International School on Foundations of Security Analysis and Design.
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