Fail Safe

A mode of termination of system functions that prevents damage. See fail secure and fail soft for comparison.  To specified system resources and system entities (i.e., specified data, property, and life) when a failure occurs or is detected in the system (but the failure still might cause a security compromise). 

See CNSSI 4009-2015 and (IETF RFC 4949 Ver 2) for more information. 

See also Fail Secure.

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