Trusted Xenix
Trusted Xenix was a variant developed by Trusted Information Systems which incorporated the Bell-La Padula model of multilevel security, and had a multilevel secure interface for the STU-III secure communications device (that is, an STU-III connection would only be made available to applications running at the same privilege level as the key loaded in the STU-III). It was evaluated by formal methods and achieved a B2 security rating under the DoD's Trusted Computer System Evaluation Criteria—the second highest rating ever achieved by an evaluated operating system. Version 2.0 was released in January 1991, version 3.0 in April 1992, and version 4.0 in September 1993. It was still in use as late as 1995.
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Famous quotes containing the word trusted:
“Naught was familiar but the heavens, from under whose roof the voyageur never passes; but with their countenance, and the acquaintance we had with river and wood, we trusted to fare well under any circumstances.”
—Henry David Thoreau (1817–1862)