> Let's Encrypt is bringing the duration of certs down not up. I believe their goal is 30 minutes validity.
replyThis is mandated by the CA/Browser Forum, which, as the name implies, is related to browsers. It says nothing about e-mail clients. In its Extended Key Usage filed (RFC 5280 § 4.2.1.12) a certificate could not have server or client authentication, but have email protection as an allowed use.
Edit: there is an RFC for "Extensions to Automatic Certificate Management Environment for End-User S/MIME Certificates"
Let's Encrypt has always had short-lived certificates, long before they were mandated by the CAB. They've been pushing the cutting edge here
replyAs far as I know 30 minutes validity is no one's goal, even long term.
replyThe most aggressive plans (not Let's Encrypt's specifically) target 7 day validities.
I say we go for one Planck time of validity.
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