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Reference.org
Access structure
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<p>Access structures are used in the study of security systems where multiple parties need to work together to obtain a resource. Groups of parties that are granted access are called qualified. In <a href="/facts/Set_theory/1ptfsvUP">set theoretic</a> terms they are referred to as qualified sets; in turn, the set of all such qualified sets is called the access structure of the system. Less formally it is a description of who needs to cooperate with whom in order to access the resource. </p>