The User Authorization Query (UAQ) Problem for RBAC, introduced by Zhang and Joshi [9], is to determine the set of roles to be activated in a single session for a particular set of permissions requested by the user. This set of roles must satisfy constraints that prevent certain combinations of roles to be activated in one session, and should follow the least privilege principle. We show that the existing approach to the UAQ problem is inadequate, and propose two approaches for solving the UAQ problem. In the first approach, we develop algorithms that use the backtracking-based search techniques developed in the artificial intelligence community. In the second approach, we reduce the problem to the MAXSAT problem which can be solved using available SAT solvers. We have implemented both approaches and experimentally evaluated them.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.