hardware mechanism

A security control implementation category consisting of physical, circuit-level, or chip-level components built into a computing platform or boundary device that enforce a security policy through the laws of electronics rather than through software logic. Information flow control, for example, may be implemented in software or hardware; hardware-enforced approaches are considered more robust because unauthorized reconfiguration cannot be achieved without physical access to the device. The distinguishing property is that the policy constraint is architecturally fixed in silicon or physical circuitry, making it resistant to software-layer attack, privilege escalation, or misconfiguration. NIST SP 800-53 invokes "hardware mechanisms" explicitly in control AC-4(7), requiring that one-way information flows—also known as data diodes or unidirectional security gateways—be enforced this way, precisely because such mechanisms prevent data from being exported from a higher-impact or classified domain while permitting import from a lower-impact domain.

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