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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
Ten Years of Let's Encrypt: Announcing support from Jeff ...
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