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Role-Based Access Control (RBAC) is a well known access control model used to preserve the confidentiality of information by specifying the ability of users to access information based on their roles. Usually these policies would be manipulated by combining or comparing them especially when defined in a distributed way. Furthermore, these policies should satisfy predefined authorization constraints. In this paper, we present an algebraic model for specifying and analyzing RBAC policies. Thedoi:10.5539/mas.v12n10p50 fatcat:rddo4cnk7vdrvdokk3l54emoz4