Abstract
In this paper, we describe the design and implementation of a two secure file servers which allow a trusted computer network to be built from untrusted computing bases. We begin with a brief review of recent results in the use of partial orderings for protection and administration of information networks, and introduce limited functionality, trusted computing base file servers as a means for allowing restricted information flow. We show the means by which such a server may be made provably secure. We consider the practicality of implementation and describe two prototype implementations for personal computers. We then summarizes results and point out possible extensions of this work.
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