Let's Encrypt

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 ...

https://letsencrypt.org/2024/04/25/guide-to-integrating-ari-into-existing-acme-clients.html

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...

https://letsencrypt.org/2024/04/12/changes-to-issuance-chains.html

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 cer...

https://letsencrypt.org/2024/03/19/new-intermediate-certificates.html

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. ...

https://letsencrypt.org/2024/03/14/introducing-sunlight.html

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 l...

https://letsencrypt.org/2023/12/28/eoy-letter-2023.html

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, ever...

https://letsencrypt.org/2023/12/13/ngos.html

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...

https://letsencrypt.org/2023/09/07/caa23.html

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 DS...

https://letsencrypt.org/2023/07/10/cross-sign-expiration.html

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 ambiti...

https://letsencrypt.org/2023/05/24/isrg-10th-anniversary.html

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 ...

https://letsencrypt.org/2023/03/23/improving-resliiency-and-reliability-with-ari.html