High Quality Content by WIKIPEDIA articles! In the security engineering subspecialty of computer science, a trusted system is a system that is relied upon to a specified extent to enforce a specified security policy. As such, a trusted system is one whose failure may break a specified security policy.Trusted systems are used for the processing, storage and retrieval of sensitive or classified information.Central to the concept of U.S. Department of Defense-style "trusted systems" is the notion of a "reference monitor", which is an entity that occupies the logical heart of the system and is responsible for all access control decisions. Ideally, the reference monitor is tamperproof, always invoked, and small enough to be subject to independent testing, the completeness of which can be assured. Per the U.S. National Security Agency's 1983 Trusted Computer System Evaluation Criteria, or Orange Book, a set of "evaluation classes" were defined that described the features and assurances that the user could expect from a trusted system.

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