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On February 10, 2027, all Let’s Encrypt subscribers will move to certificates with 64 day lifetimes by default unless they select an even shorter lifetime (45 or 6 days, as previously announced ). This means that any certificate we issue o…
gemeldet 7. Okt. 2026
When the scripts that generate the data for letsencrypt.org/stats broke yet again, we decided to retire them rather than repair them. Let’s Encrypt issues six to ten million certificates each day , producing a large volume of logs that kee…
gemeldet 17. Sept. 2026
Ten years ago, we printed one of the nerdiest t-shirts we’ve ever made. On the front was the entire PEM encoding of ISRG Root X1 in base64. Back then, it represented a future we were working toward. Today, that same design tells the story …
gemeldet 11. Aug. 2026
Let’s Encrypt is committed to a post-quantum-safe Web PKI. The path we’re planning to take is Merkle Tree Certificates (“MTCs”), a new approach that adds post-quantum authentication to the web without sacrificing the speed and reliability …
gemeldet 3. Juni 2026
Have you ever needed to make sure your website has a broken certificate? While many tools exist to help run an HTTPS server with valid certificates, there aren’t tools to make sure your certificate is revoked or expired. This is not a prob…
gemeldet 10. April 2026
Nick Silverman is a Senior Infrastructure Engineer on the Edge Infrastructure team at Shopify, where he maintains the systems that provision, renew, and publish SSL certificates for millions of merchants’ custom domains. He is also a contr…
gemeldet 17. März 2026
This was also posted on EFF’s blog . As we announced earlier this year, Let’s Encrypt now issues IP address and six-day certificates to the general public. The Certbot team at the Electronic Frontier Foundation has been working on two impr…
gemeldet 11. März 2026
As previously announced , over the next two years we will be switching the default certificate lifetime from 90 days to 64 days, and then 45 days. This will ultimately double the number of certificate renewal requests each day: today we ex…
gemeldet 24. Feb. 2026
When you request a certificate from Let’s Encrypt, our servers validate that you control the hostnames in that certificate using ACME challenges . For subscribers who need wildcard certificates or who prefer not to expose infrastructure to…
gemeldet 18. Feb. 2026
In a recent conversation with a Let’s Encrypt subscriber, we asked them to guess how many people work at ISRG, the nonprofit behind Let’s Encrypt (and Prossimo and Divvi Up). Their guess was about 100; they’d overestimated by 72.5 people. …
gemeldet 5. Feb. 2026
Update: March 11, 2026 If you use Certbot, see Six-Day and IP Address Certificates Available in Certbot for details on requesting these certificates. Short-lived and IP address certificates are now generally available from Let’s Encrypt. T…
gemeldet 15. Jan. 2026
This letter was originally published in our 2025 Annual Report . This year was the 10th anniversary of Let’s Encrypt. We’ve come a long way! Today we’re serving more than 700 million websites, issuing ten million certificates on some days.…
gemeldet 29. Dez. 2025
On September 14, 2015, our first publicly-trusted certificate went live. We were proud that we had issued a certificate that a significant majority of clients could accept, and had done it using automated software . Of course, in retrospec…
gemeldet 9. Dez. 2025
Let’s Encrypt will be reducing the validity period of the certificates we issue. We currently issue certificates valid for 90 days, which will be cut in half to 45 days by 2028. This change is being made along with the rest of the industry…
gemeldet 2. Dez. 2025
In a ceremony held in September, Let’s Encrypt generated two new Root Certification Authorities (CAs) and six new Intermediate CAs, which we’re collectively calling the “Generation Y” hierarchy. Now we’re moving to begin issuing certificat…
gemeldet 24. Nov. 2025
Seth Schoen was an early contributor to Let's Encrypt through his work at the Electronic Frontier Foundation. He's also one of the longest standing participants in the Let's Encrypt community support forum, so we asked him to offer his tho…
gemeldet 7. Okt. 2025
Let’s Encrypt has been proud to work with the IETF to maintain ACME as an open standard since we first developed the technology a decade ago. We’re happy to announce that IETF has published our latest addition to the ACME protocol, ACME Re…
gemeldet 16. Sept. 2025
NGINX and Let's Encrypt share a common vision of an open and secure web. Now, with built-in support for ACME, the world's most popular web server, reverse proxy and ingress controller for Kubernetes can simplify certificate management for …
gemeldet 11. Sept. 2025
Update, August 18, 2025 We have updated the read-only and shutdown dates to ensure that our new Static CT API logs are fully trusted by browsers before switching Oak to read-only in order to avoid any disruption. Let’s Encrypt operates two…
gemeldet 14. Aug. 2025
Today we turned off our Online Certificate Status Protocol (OCSP) service, as announced in December of last year. We stopped including OCSP URLs in our certificates more than 90 days ago, so all Let’s Encrypt certificates that contained OC…
gemeldet 6. Aug. 2025
Update: January 15, 2026 Six-day and IP address certificates are now generally available. See 6-day and IP Address Certificates are Generally Available for details. Since Let’s Encrypt started issuing certificates in 2015, people have repe…
gemeldet 1. Juli 2025
Since its inception, Let’s Encrypt has been sending expiration notification emails to subscribers that have provided an email address to us via the ACME API. This service ended on June 4, 2025. The decision to end the service is the result…
gemeldet 26. Juni 2025
The Certificate Transparency ecosystem has been improving transparency for the web PKI since 2013. It helps make clear exactly what certificates each certificate authority has issued and makes sure errors or compromises of certificate auth…
gemeldet 11. Juni 2025
Every night, right around midnight (mainly UTC ), a horde of zombies wakes up and clamors for … digital certificates! The zombies in question are abandoned or misconfigured Internet servers and ACME clients that have been set to request ce…
gemeldet 4. Juni 2025
At Let’s Encrypt we know that building a secure Internet isn’t just a technical challenge—it’s a long-term commitment. Over the past decade we’ve made enormous strides: from issuing billions of TLS certificates to continually innovating to…
gemeldet 21. Mai 2025
Update March 16, 2026: Thanks to some timeline changes in the root program requirements, we have been able to push back the removal of the tlsclient profile slightly. If you are already using the tlsclient profile before May 13, 2026, now …
gemeldet 14. Mai 2025
How Pebble Supports ACME Client Developers Together with the IETF community, we created the ACME standard to support completely automated certificate issuance. This open standard is now supported by dozens of clients . On the server side, …
gemeldet 30. April 2025
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 firs…
gemeldet 18. März 2025
Earlier this year we announced our intention to introduce short-lived certificates with lifetimes of six days as an option for our subscribers. Yesterday we issued our first short-lived certificate. You can see the certificate at the botto…
gemeldet 20. Feb. 2025
2025 marks ten years of Let’s Encrypt. Already this year we’ve taken steps to continue to deliver on our values of user privacy , efficiency , and innovation , all with the intent of continuing to deliver free TLS certificates to as many p…
gemeldet 14. Feb. 2025
Let’s Encrypt protects a vast portion of the Web by providing TLS certificates to over 550 million websites —a figure that has grown by 42% in the last year alone. We currently issue over 340,000 certificates per hour. To manage this immen…
gemeldet 30. Jan. 2025
Since its inception, Let’s Encrypt has been sending expiration notification emails to subscribers that have provided an email address to us. We will be ending this service on June 4, 2025. The decision to end this service is the result of …
gemeldet 22. Jan. 2025
Update: January 15, 2026 Six-day and IP address certificates are now generally available. See 6-day and IP Address Certificates are Generally Available for details. This year we will continue to pursue our commitment to improving the secur…
gemeldet 16. Jan. 2025
We are excited to announce a new extension to Let’s Encrypt’s implementation of the ACME protocol that we are calling “profile selection.” This new feature will allow site operators and ACME clients to opt in to the next evolution of Let’s…
gemeldet 9. Jan. 2025
This letter was originally published in our 2024 Annual Report . The past year at ISRG has been a great one and I couldn’t be more proud of our staff, community, funders, and other partners that made it happen. Let’s Encrypt continues to t…
gemeldet 11. Dez. 2024
Earlier this year we announced our intent to provide certificate revocation information exclusively via Certificate Revocation Lists (CRLs) , ending support for providing certificate revocation information via the Online Certificate Status…
gemeldet 5. Dez. 2024
Today we are announcing our intent to end Online Certificate Status Protocol (OCSP) support in favor of Certificate Revocation Lists (CRLs) as soon as possible. OCSP and CRLs are both mechanisms by which CAs can communicate certificate rev…
gemeldet 23. Juli 2024
When we look at the general security posture of Let’s Encrypt, one of the things that worries us most is how much of the operating system and network infrastructure is written in unsafe languages like C and C++. The CA software itself is w…
gemeldet 24. Juni 2024
Let’s Encrypt is proud to have been partnering with the Center for Information Technology Policy team at Princeton University since 2018 to bolster defenses against Border Gateway Protocol (BGP) attacks. We’re thrilled to continue this par…
gemeldet 30. Mai 2024
Since March 2023, Let’s Encrypt has been improving our resiliency and reliability via ACME Renewal Information ( ARI ). ARI makes it possible for our Subscribers to handle certificate revocation and renewal easily and automatically. A prim…
gemeldet 1. Mai 2024
Following our previous post on the foundational benefits of ACME Renewal Information ( ARI ), this one offers a detailed technical guide for incorporating ARI into existing ACME clients. Since its introduction in March 2023, ARI has signif…
gemeldet 25. April 2024
On Thursday, June 6th, 2024 , we will be switching issuance to use our new intermediate certificates . Simultaneously, we are removing the DST Root CA X3 cross-sign from our API, aligning with our strategy to shorten the Let’s Encrypt chai…
gemeldet 12. April 2024
On Wednesday, March 13, 2024, Let’s Encrypt generated 10 new Intermediate CA Key Pairs, and issued 15 new Intermediate CA Certificates containing the new public keys. These new intermediate certificates provide smaller and more efficient c…
gemeldet 19. März 2024
Let’s Encrypt is proud to introduce Sunlight, a new implementation of a Certificate Transparency log that we built from the ground up with modern Web PKI opportunities and constraints in mind. In partnership with Filippo Valsorda , who led…
gemeldet 14. März 2024
This letter was originally published in our 2023 Annual Report . We typically open our annual report with a letter from our Executive Director and co-founder, Josh Aas, but he’s on parental leave so I’ll be filling in. I’ve run the Brand &…
gemeldet 28. Dez. 2023
For more than ten years, we at the nonprofit Internet Security Research Group (ISRG) have been focused on our mission of building a more secure and privacy-respecting Internet for everyone, everywhere. As we touch on in our 2023 Annual Rep…
gemeldet 13. Dez. 2023
According to Cloudflare’s Merkle Town , 257,036 certificates are issued every hour. We at Let’s Encrypt are issuing close to 70% of those certs. Being a Certificate Authority that operates as a nonprofit for the public’s benefit means we a…
gemeldet 7. Sept. 2023
When Let’s Encrypt first launched, we needed to ensure that our certificates were widely trusted. To that end, we arranged to have our intermediate certificates cross-signed by IdenTrust’s DST Root CA X3 . This meant that all certificates …
gemeldet 10. Juli 2023
It’s hard to believe 10 years have passed since Eric Rescorla, Alex Halderman, Peter Eckersley and I founded ISRG as a nonprofit home for public benefit digital infrastructure. We had an ambitious vision, but we couldn’t have known then th…
gemeldet 24. Mai 2023
The Let’s Encrypt team is excited to announce that ACME Renewal Information (ARI) is live in production! ARI makes it possible for our subscribers to handle certificate revocation and renewal as easily and automatically as the process of g…
gemeldet 23. März 2023