Abstract
Role Based Access Control (RBAC) is a very popular access control model, for a long time investigated and widely deployed in the security architecture of different enterprises. To implement RBAC, roles have to be firstly identified within the considered organization. Usually the process of (automatically) defining the roles in a bottom up way, starting from the permissions assigned to each user, is called role mining. In literature, the role mining problem has been formally analyzed and several techniques have been proposed in order to obtain a set of valid roles.
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