Renewal of a certificate


I am new to Let’s encrypt and certificates as a whole and I was wondering - when you renew a certificate does it create a new one or the valid date gets extended?
I searched for this on the site, but couldn’t find anything.

Thank you!

“Renewal” is more of an abstract concept - on a technical level, it’s a new certificate with a new validity period. Changing anything in an existing certificate would cause the signature to become invalid, so a renewed certificate is newly signed with the new validity period. (Some other fields, like the serial number, change too.)


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