Abstract
Some extensions to the lattice model for computer security control are considered in this paper. These extensions include: (1) a lattice model suitable for a system in which security classes can be dynamically created; (2) definitions of class-combining operators other than the least upper bound in dynamic systems; and (3) a join-semilattice and a partial order model which have fewer restrictions than the lattice model. Several possible implementations of the extended lattice model are also considered. Lattices are categorized bythe dimensions of their partial orders. A dimension-two lattice implementation, based on the concept of NTree, is considered for both static and dynamic systems. The implementation for dynamic lattices proposed here proves to be efficient.
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