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阮一峰的网络日志
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Let's Encrypt

The difficulty of making sure your website is broken Simplifying Certificate Renewals for Millions of Domains with ACME Renewal Information (ARI) Six-Day and IP Address Certificates Available in Certbot Shorter Certificate Lifetimes and Rate Limits DNS-PERSIST-01: A New Model for DNS-based Challenge Validation On the Importance of "Hello" and "Thanks" 6-day and IP Address Certificates are Generally Available 10 Years of Let's Encrypt Certificates Decreasing Certificate Lifetimes to 45 Days New "Generation Y" Hierarchy of Root and Intermediate Certificates Ten Years of Community Support ACME Renewal Information (ARI) Published as RFC 9773 Native ACME Support Comes to NGINX End of Life Plan for RFC 6962 Certificate Transparency Logs OCSP Service Has Reached End of Life We've Issued Our First IP Address Certificate Expiration Notification Service Has Ended Reflections on a Year of Sunlight How We Reduced the Impact of Zombie Clients Sustaining a More Secure Internet: The Power of Recurring Donations Ending TLS Client Authentication Certificate Support in 2026 How Pebble Supports ACME Client Developers Ten Years of Let's Encrypt: Announcing support from Jeff Atwood We Issued Our First Six Day Cert Encryption for Everybody Scaling Our Rate Limits to Prepare for a Billion Active Certificates Ending Support for Expiration Notification Emails Announcing Six Day and IP Address Certificate Options in 2025 Announcing Certificate Profile Selection Ending OCSP Support in 2025
Let's Encrypt Launch Schedule
2015-06-16 · via Let's Encrypt

By Josh Aas, ISRG Executive Director ·

Let’s Encrypt has reached a point where we’re ready to announce our launch schedule.

  • First certificate: Week of July 27, 2015
  • General availability: Week of September 14, 2015

We will issue the first end entity certificates under our root under tightly controlled circumstances. No cross-signature will be in place yet, so the certificates will not validate unless our root is installed in client software. As we approach general availability we will issue more and more certificates, but only for a pre-approved set of domains. This limited issuance period will give us time to further ensure that our systems are secure, compliant, and scalable.

When it’s time for general availability, we will open up our systems to certificate requests for any domain. A cross-signature from IdenTrust will be in place for general availability, so that our certificates will validate automatically for the vast majority of consumers.

Engineering and policy development for Let’s Encrypt began in earnest in mid-October of 2014. If we stay true to the schedule outlined above we will have built an innovative CA, capable of operating at Internet scale and without cutting corners, in just eleven months. That’s quite a feat, given all that’s involved, and a testament to the skill and dedication of our staff, partners, sponsors, and contributors.