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EXECUTABLE SURFACE
Certificate lifetimes are compressing. Rotation frequency is increasing. Control dashboards are greening. The assurance class of the underlying key material has not changed.
EXECUTIVE SIGNAL SUMMARY
DigiCert began enforcing 200-day TLS certificate lifespans on February 20. Sectigo follows on March 8. The CA/Browser Forum mandatory enforcement phase begins March 15. Industry discussion has moved to 100-day and 47-day horizons. Boards are receiving rotation frequency as a maturity indicator. Compliance frameworks are recording shorter lifetimes as control improvement.
If the key material backing those certificates remains exportable, the exposure class is identical at 200 days, 100 days, and 47 days. Duration changed. Class did not.
THE CONDITION
A software-generated private key issued for 200 days and a software-generated private key issued for 47 days share the same properties: both are exportable, both are copyable, both can be extracted from the host without detection, both produce valid signatures from any machine that possesses them. Rotation bounds validity. It does not bound exfiltration.
Duration is a temporal property. Assurance class is an architectural property. One answers "how long." The other answers "from where." They do not substitute for each other.
Exportability is the dividing line. When a private key cannot leave the device that generated it, the credential proves something about the device, not just something about the certificate. Rotation on top of non-exportable keys compounds the improvement: shorter windows and verified provenance. Rotation without non-exportability compresses exposure windows around credentials whose origin remains unverifiable.
Certificate lifetime compression does reduce exposure duration. That is a real operational improvement. It bounds the window in which a compromised credential remains valid. It forces automation. It penalizes manual process. None of that is in dispute. What is in dispute is whether duration improvement constitutes class improvement. It does not.
THE EXPOSURE CONDITION
Organizations are reporting increased rotation metrics as governance maturity. Boards are seeing shorter certificate lifetimes and interpreting them as strengthened posture. Auditors are recording higher rotation frequency as control improvement.
The classification error is systemic: rotation frequency is being used as a proxy for assurance class. They are not the same measurement. An organization rotating exportable software keys every 47 days has a shorter exposure window than one rotating every 365 days. It does not have a different exposure class. The key can still be copied. The credential can still be replayed from a machine that never held the original issuance.
When this misclassification enters a risk register, the downstream consequences compound. Capital allocation decisions reference a control improvement that changed duration, not class. Audit narratives describe strengthened posture using a metric that does not measure what it is credited with measuring. Board reporting diverges from technical reality by exactly the distance between "rotated faster" and "proved where the key was."
If your last board presentation reported rotation improvement, whether assurance class was evaluated or assumed is a matter of record.
When your board sees 47-day rotation reported as maturity improvement, the question that was not asked: did the proof of origin change, or just the window of validity?
CHQ Position 2026-007 holds that certificate lifetime compression does not alter assurance class when underlying key material remains exportable. This analysis examines the institutional consequences when the metric being reported to boards measures duration, not class.
UNRESOLVED
If assurance class did not change, what was certified as stronger?
FORMALIZATION PATH
The determination may be formally issued