PRIMARY QUESTIONS - I am uncertain about the sub-key.  When I attempt to 'expire' it the date does not seem to change.

The first question I have is, "How did you attempt to 'expire' it?"

SECONDARY QUESTION - is there documentation regarding 'best practices' on managing expiring keys and renewing via sub-keys

Unfortunately, no.

There will certainly be well-meaning people who will speak up with their own idea of what the best practices for such a thing are. I encourage skepticism. Key management is at least 95% policy, and policy will vary from person to person and place to place based on each individual's perceptions of risks and risk mitigation strategies.

By all means listen to these opinions, but please be skeptical of thinking they are correct. What makes sense for one person's risk profile may not make sense for yours. There are very few universal truths here, and that makes attempts at compiling best practices extremely difficult.


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