Unverified50% confidenceDecision RuleExact time
The fail-closed principle requires that a system default to blocking rather than defaulting to allowing when it fails, and in security engineering the former is almost always recommended.
1
Sources
50%
Confidence
Long-term
Relevance
10/13/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedA fail-closed design holds only for the operations the hook actually covers; if an equivalent path has no hook registered, the system is effectively fail-open for that path, and single-point fail-closed cannot be used to infer overall security.74% similarUnverifiedFail-open refers to defaulting to allow passage under abnormal conditions, as opposed to fail-closed.73% similar
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