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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 Intent to End OCSP Service More Memory Safety for Let’s Encrypt: Deploying ntpd-rs Let’s Encrypt Continues Partnership with Princeton to Bolster Internet Security Takeaways from Tailscale’s Adoption of ARI An Engineer’s Guide to Integrating ARI into Existing ACME Clients Deploying Let's Encrypt's New Issuance Chains New Intermediate Certificates Introducing Sunlight, a CT implementation built for scalability, ease of operation, and reduced cost A Year-End Letter from our Vice President Our role in supporting the nonprofit ecosystem Increase your security governance with CAA Shortening the Let's Encrypt Chain of Trust ISRG’s 10th Anniversary Improving Resiliency and Reliability for Let’s Encrypt with ARI Thank you to our 2023 renewing sponsors A Look into the Engineering Culture at ISRG Let’s Encrypt improves how we manage OCSP responses A New Life for Certificate Revocation Lists Nurturing Continued Growth of Our Oak CT Log TLS Beyond the Web: How MongoDB Uses Let’s Encrypt for Database-to-Application Security Let’s Encrypt Receives the Levchin Prize for Real-World Cryptography New Major Funding from the Ford Foundation TLS Simply and Automatically for Europe’s Largest Cloud Customers Making the Web safer and more secure for everyone Resources for Certificate Chaining Help Speed at scale: Let’s Encrypt serving Shopify’s 4.5 million domains Preparing to Issue 200 Million Certificates in 24 Hours The Next Gen Database Servers Powering Let's Encrypt A Year-End Letter from the Executive Director of Let's Encrypt and ISRG Extending Android Device Compatibility for Let's Encrypt Certificates Standing on Our Own Two Feet [Updated] Let's Encrypt's New Root and Intermediate Certificates Let's Encrypt Has Issued a Billion Certificates Multi-Perspective Validation Improves Domain Validation Security How Let's Encrypt Runs CT Logs Onboarding Your Customers with Let's Encrypt and ACME Introducing Oak, a Free and Open Certificate Transparency Log Transitioning to ISRG's Root The ACME Protocol is an IETF Standard Facebook Expands Support for Let’s Encrypt Looking Forward to 2019 Let's Encrypt Root Trusted By All Major Root Programs Engineering deep dive: Encoding of SCTs in certificates Looking Forward to 2018 ACME Support in Apache HTTP Server Project Wildcard Certificates Coming January 2018 Milestone: 100 Million Certificates Issued ACME v2 API Endpoint Coming January 2018 OVH Renews Platinum Sponsorship of Let's Encrypt Let’s Encrypt 2016 In Review Launching Our Crowdfunding Campaign Our First Grant: The Ford Foundation Squarespace OCSP Stapling Implementation Introducing Internationalized Domain Name (IDN) Support ISRG Legal Transparency Report, January 2016 - June 2016 What It Costs to Run Let's Encrypt Let's Encrypt Root to be Trusted by Mozilla Full Support for IPv6 Defending Our Brand [Updated] Progress Towards 100% HTTPS, June 2016 Leaving Beta, New Sponsors ISRG Legal Transparency Report, July 2015 - December 2015 New Name, New Home for the Let's Encrypt Client Software Our Millionth Certificate OVH Sponsors Let's Encrypt Entering Public Beta Facebook Sponsors Let's Encrypt Public Beta: December 3, 2015 Why ninety-day lifetimes for certificates? The CA's Role in Fighting Phishing and Malware
Updated Let's Encrypt Launch Schedule
2015-08-07 · via Let's Encrypt

By Josh Aas, ISRG Executive Director ·

We can’t wait to see websites turn on TLS with Let’s Encrypt. Trust is our most important asset, however, and we need to take the necessary time to make sure our systems are secure and stable.

We’ve decided to push our launch schedule back a bit to give us time to further improve our systems. Our new schedule is:

  • First certificate: Week of September 7, 2015
  • General availability: Week of November 16, 2015

In the ten weeks between these two dates we’ll gradually issue more and more certificates. We’ll start by issuing a small number of certs to whitelisted domains and expand our issuance as we gain confidence in our systems (stay tuned for instructions on getting your domains added to our early-access whitelist). When it’s time for general availability we will open up our systems to all requests.

A cross-signature will be in place before general availability. This will allow certificates from Let’s Encrypt to validate automatically for the vast majority of consumers. Prior to cross-signing, browsers will not accept our certificates as valid unless a user has installed our root as trusted.

I want to thank our staff, partners, sponsors, and contributors. We’re making great progress, despite this delay, and it’s all possible due to their hard work.