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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 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 Let's Encrypt is Trusted
Ten Years of Let's Encrypt: Announcing support from Jeff Atwood
2025-03-18 · via Let's Encrypt

By Josh Aas, Dan Fernelius ·

As we touched on in our first blog post highlighting ten years of Let’s Encrypt: Just as remarkable to us as the technical innovations behind proliferating TLS at scale is the sustained generosity we have benefited from throughout our first decade.

With that sense of gratitude top of mind, we are proud to announce a contribution of $1,000,000 from Jeff Atwood. Jeff has been a longtime supporter of our work, beginning many years ago with Discourse providing our community forum pro bono; something Discourse still provides to this day. As best we can tell, our forum has helped hundreds of thousands of people get up and running with Let’s Encrypt—an impact that has helped billions of people use an Internet that’s more secure and privacy-respecting thanks to widely adopted TLS.

When we first spoke with Jeff about the road ahead for Let’s Encrypt back in 2023, we knew a few things wouldn’t change no matter how the Internet changes over the next decade:

  1. Free TLS is the only way to ensure it is and remains accessible to as many people as possible.
  2. Let’s Encrypt is here to provide a reliable, trusted, and sound service no matter the scale.
  3. Generosity from our global community of supporters will be how we sustain our work.

We’re proud that Jeff not only agrees, but has chosen to support us in such a meaningful way. In discussing how Jeff might want us to best celebrate his generosity and recognize his commitment to our work, he shared:

Let's Encrypt is a golden example of how creating inalienable good is possible with the right approach and the right values. And while I'm excited about the work Let's Encrypt has done, I am eager to see their work continue to keep up with the growing Web; to sustain encryption for everybody at Internet scale. To do so is going to take more than me—it's going to take a community of people committed to this work. I am confident Let's Encrypt is a project that deserves all of our support, in ways both large and small.

Indeed, this contribution is significant because of its scale, but more importantly because of its signal: a signal that supporting the not-so-glamorous but oh-so-nerdy work of encryption at scale matters to the lives of billions of people every day; a signal that supporting free privacy and security afforded by TLS for all of the Internet’s five billion users just makes sense.

Ten years ago we set out to build a better Internet through easy-to-use TLS. If you or your organization have supported us throughout the years, thank you for joining Jeff in believing in the work of Let’s Encrypt. For a deeper dive into the impact of Let’s Encrypt and ISRG’s other projects, take a look at our most recent annual report.

Let’s Encrypt is a project of the nonprofit Internet Security Research Group, a 501(c)(3) nonprofit committed to protecting Internet users by lowering monetary, technological, and informational barriers to a more secure and privacy-respecting Internet. For more, visit abetterinternet.org. Press inquiries can be sent to press@abetterinternet.org