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Authorization in distributed systems: a formal approach

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2 Author(s)
T. Y. C. Woo ; Dept. of Comput. Sci., Texas Univ., Austin, TX, USA ; S. S. Lam

It is argued that authorization is an independent semantic concept that must be separated from implementation mechanisms and given a precise semantics. A logical approach to representing and evaluating authorization is proposed. Specifically, a language for specifying policy bases is introduced. A policy base encodes a set of authorization requirements and is given a precise semantics based on a formal notion of authorization policy. The semantics is computable, thus providing a basis for authorization evaluation. Two composition operators for policy bases which are appropriate for modeling distributed systems with multiple administrative domains are introduced

Published in:

Research in Security and Privacy, 1992. Proceedings., 1992 IEEE Computer Society Symposium on

Date of Conference:

4-6 May 1992