Episode 40 — Choose Fail Open, Fail Secure, and Fail Closed Using Mission Logic
This episode teaches how to choose fail open, fail secure, and fail closed behaviors based on mission logic, safety, and risk, which is a frequent ISSEP scenario because the “right” answer depends on context and consequences. We define each failure mode and explain what it implies for confidentiality, integrity, and availability when components break, networks partition, or dependencies time out. You’ll learn how to evaluate failure behavior for authentication systems, safety-critical controls, monitoring pipelines, and access to essential services, including how to avoid designs where a minor outage becomes a full denial of service or where a fail-open shortcut becomes a permanent bypass. We also cover best practices like graceful degradation, staged authorization, and explicit emergency modes with strong auditing, plus troubleshooting issues such as inconsistent fail behavior across components and unclear operational procedures during partial failures. A mission-focused example shows how to defend your choice with measurable criteria, stakeholder requirements, and documented assumptions that can be validated. Produced by BareMetalCyber.com, where you’ll find more cyber audio courses, books, and information to strengthen your educational path. Also, if you want to stay up to date with the latest news, visit DailyCyber.News for a newsletter you can use, and a daily podcast you can commute with.
