Let's Encrypt Now Offers 6-Day and IP Address Certificates for Enhanced Security

Summary

Let's Encrypt has made short-lived certificates (valid for 160 hours/6 days) and IP address certificates generally available. These certificates improve security by requiring more frequent validation and reducing reliance on unreliable revocation mechanisms. The shorter validity period reduces the vulnerability window if a certificate's private key is compromised, as traditional 90-day certificates leave relying parties vulnerable until expiration when revocation systems fail.