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- W2073525935 abstract "In this paper we propose an information-theoretic approach to the access control problem in a scenario where a group of users is divided into a number of disjoint classes. The set of rules that specify the information flow between different user classes in the system defines an access control policy . An access control policy can be implemented by using a key assignment scheme , where a trusted central authority (CA) assigns an encryption key and some private information to each class. We consider key assignment schemes where the key assigned to each class is unconditionally secure with respect to an adversary controlling a coalition of classes of a limited size. Our schemes are characterized by a security parameter r , the size of the adversary coalition. We show lower bounds on the size of the private information that each class has to store and on the amount of randomness needed by the CA to set up any key assignment scheme. Finally, we propose some optimal constructions for unconditionally secure key assignment schemes." @default.
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- W2073525935 date "2006-02-01" @default.
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- W2073525935 title "Unconditionally secure key assignment schemes" @default.
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- W2073525935 doi "https://doi.org/10.1016/j.dam.2005.03.025" @default.
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