[cabfpub] Certificate validity periods

Jeremy Rowley jeremy.rowley at digicert.com
Wed Mar 30 16:04:06 UTC 2016

Hi everyone, 


I'd like to resurface the certificate validity period discussion and see if
there is a way to move this forward.  I'm still keen on seeing a
standardized maximum validity period for all certificate types, regardless
of whether the certificate is DV, OV, or EV. I believe the last time this
was discussed, we reached an impasse where the browsers favored a shorter
validity period for OV/DV and the CAs were generally supportive of a
longer-lived EV certificate (39 months). The argument for a shorter validity
period were 1) encourages key replacement, 2) ensures validation occurs more
frequently, 3) deters damage caused by key loss or a change in domain
control, and 4) permits more rapid changes in industry standards and
accelerates the phase-out of insecure practices. The argument for longer
validity periods: 1) customers prefer longer certificate validity periods,
and 2) the difficulty in frequent re-validation of information. 


So far, there seems to be two change proposals with a couple of variations:


1)      Set all certificate validity periods to no more than 27 months

a.       Require re-validation of information for OV/DV certificates at 39
months OR

b.       Require re-validation of information for all certs at 13 months

2)      Set all certificate validity periods to 39 months

a.       Require re-validation every 13 months

b.       Require re-validation of information for OV/DV certificates at 39


What are the objections to 1a? With all the automated installers abounding,
1a seems to capture the simplicity and customer convenience of 39 months
with the advantages of shorter-lived certs. Who would oppose/endorse a
ballot that does one of these? 



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