[cabfpub] Short-lived certs

Ryan Sleevi sleevi at google.com
Wed Oct 4 22:58:16 MST 2017

On Wed, Oct 4, 2017 at 10:54 PM, Jeremy Rowley <jeremy.rowley at digicert.com>

> Pre-signing OCSP responses for these certs is a waste of time as they’ll
> expire before the OCSP is ever delivered.
> Delivered to who? Are you saying you deliver certificates before you've
> produced OSP responses?
>    - If we pre-sign an OCSP response for a 15 min cert, the OCSP is
>    rarely used.
But that's different than what you said - you indicated that 15 minutes is
because the OCSP is delivered, and I was trying to understand delivered to

>    -
> When you are signing certs daily, even signing that first OCSP response
> eats up lots of processing power without providing any benefit to the
> user.  Removing OCSP for short-lived certs eliminates an external call to
> the CA
> Stapling
>    - These are usually on a home network. Getting an OCSP response to
>    staple through the firewall usually doesn’t happen
> Can you explain how you deliver a cert, but cannot deliver an OCSP
response for said cert?

> -                      Clock skew is a problem. That is the assumption.
> But that’s not really relevant to the OCSP issue right? That’s more an
> issue with certificate lifecycles. My contention is that OCSP provides
> little value in the context of a three day, or less, cert.
Well, your stated objective is to support lifetimes for as low as 15
minutes. If this objective is not reasonable - or is detrimental - then the
need to not include revocation information no longer there, right? Or are
there other reasons that weren't enumerated?
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