Abstract
The problem of role engineering is extended by the subproblem of permissions engineering. It is assumed that discretionary access control is specified in the information system. To build a role-based security policy, a technique based on algorithms for formal concept analysis is proposed. Based on the access matrix, a Galois lattice is constructed, the nodes of which are interpreted as possible permissions. Criteria for choosing the optimal set of permissions are determined and a heuristic algorithm for solving the problem is discussed.
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