Let’s Encrypt will be reducing the validity period of the certificates we issue. We currently issue certificates valid for 90 days, which will be cut in half to 45 days by 2028.
This change is being made along with the rest of the industry, as required by the CA/Browser Forum Baseline Requirements, which set the technical requirements that we must follow. All publicly-trusted Certificate Authorities like Let’s Encrypt will be making similar changes. Reducing how long certificates are valid for helps improve the security of the internet, by limiting the scope of compromise, and making certificate revocation technologies more efficient.
clearly the most secure option is to have certificates that are only valid for 30 seconds at a time
Well it should be as short as possible while still being practical. LE doesn’t have infinite server compute, renewal also takes some amount of time, plus if they make the validity too short people might stop using them (pretty evident judging from sentiment here) and move to other CAs and make what they do pointless.
45 days are still plenty of time yet people are already complaining. Does make me worry.
Let’s be extra safe. New cert per every request
Ephemeral diffie-hellman is exactly that, it’s part of TLS since I think 1.2