Let's Encrypt
Certificate authority which provides free domain-validated certificates
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| April 2022 | Let's Encrypt was awarded the Levchin Prize for improvements to the certificate ecosystem. |
| June 1 2021 | ACMEv1 API was completely shut down, marking the full end of the pre-standard ACME protocol |
| January 2021 | Let's Encrypt began implementing 24-hour brownouts for ACMEv1 protocol |
| September 3 2020 | Let's Encrypt issued six new certificates, including a new ECDSA root named 'ISRG Root X2', four intermediates, and one cross-sign. The new root was cross-signed with ISRG Root X1. |
| June 2020 | Let's Encrypt ceased accepting new domain validations for ACMEv1 protocol |
| March 2020 | Let's Encrypt was awarded the Free Software Foundation's annual Award for Projects of Social Benefit. |
| March 3 2020 | Let's Encrypt announced potential revocation of over 3 million certificates due to a software flaw. |
| February 27 2020 | Let's Encrypt announced having issued a billion certificates. |
| November 8 2019 | Let's Encrypt stopped accepting new account registrations for ACMEv1 protocol |
| March 2018 | Let's Encrypt added support for ACME v2 protocol and wildcard certificates, expanding its certificate issuance capabilities. |
| April 12 2016 | Let's Encrypt officially launched, ending the public beta period. |
| December 3 2015 | Public beta of Let's Encrypt commenced. |
| October 19 2015 | Intermediate certificates became cross-signed by IdenTrust, enabling trust by all major browsers. |
| September 14 2015 | Let's Encrypt issued its first certificate and submitted root program applications to Mozilla, Microsoft, Google, and Apple. |
| June 2015 | Let's Encrypt announced the generation of their first RSA root certificate, ISRG Root X1, which was used to sign two intermediate certificates cross-signed by IdenTrust. |
| April 9 2015 | ISRG and the Linux Foundation declared their collaboration. |
| January 28 2015 | ACME protocol was officially submitted to the IETF for standardization. |
| November 18 2014 | Let's Encrypt was publicly announced. |
| May 2013 | Internet Security Research Group (ISRG), the company behind Let's Encrypt, was incorporated. |
| 2012 | Let's Encrypt project was started by Josh Aas, Eric Rescorla, Peter Eckersley, and J. Alex Halderman. |
This contents of the box above is based on material from the Wikipedia article Let's Encrypt, which is released under the Creative Commons Attribution-ShareAlike 4.0 International License.