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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-15 and was most recently seen on 2026-05-15.
In operating systems architecture, a reference monitor concept defines a set of design requirements on a reference validation mechanism, which enforces an access control policy over subjects' ability to perform operations on objects on a system. The properties of a reference monitor are captured by the acronym NEAT, which means:The reference validation mechanism must be Non-bypassable, so that an attacker cannot bypass the mechanism and violate the security policy.
The reference validation mechanism must be Evaluable, i.e., amenable to analysis and tests, the completeness of which can be assured (verifiable). Without this property, the mechanism might be flawed in such a way that the security policy is not enforced.
The reference validation mechanism must be Always invoked. Without this property, it is possible for the mechanism to not perform when intended, allowing an attacker to violate the security policy.
The reference validation mechanism must be Tamper-proof. Without this property, an attacker can undermine the mechanism itself and hence violate the security policy.
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