The CA/B Forum’s mandate to reduce TLS certificate validity to 47 days by 2029 represents a fundamental shift in digital trust, emphasizing agility, automation, and continuous renewal. Shorter lifespans reduce exposure to key compromise, eliminate reliance on unreliable revocation checks, and make expiration itself a security feature. Already, leading organizations use certificates lasting 90, 30, or even 7 days, showing this change is well underway. Success requires full automation, visibility, and integration across internal and external PKI systems. By rotating certificates and keys frequently, organizations strengthen resilience, minimize outage risks, and build cryptographic agility for post-quantum readiness.

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