Many organizations have policies to not re-use keys between certificates. Dropping the validity period therefore effectively drops the key usage period.
> On Feb 21, 2017, at 10:54 AM, Ryan Sleevi via Public <[email protected]> > wrote: > > This doesn't seem particularly relevant - I haven't heard any suggestion that > this is about ensuring frequent key rotation, as opposed to all the other > policies and practices being attested to in conjunction with the keys. > > On Tue, Feb 21, 2017 at 10:52 AM, Dean Coclin via Public <[email protected] > <mailto:[email protected]>> wrote: > Posting on behalf of AT&T: > > > > AT&T typically looks to NIST for guidance and reference on industry > standards, see page 45 of the attached (NIST SP800-57-Pt1R4) document.
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