If you have questions about how to use Let’s Encrypt, please ask on Let’s Encrypt Community Support.
For information about various technical mailing lists, please visit our Get Involved page.
Please do not write to this address unless your message concerns a security issue with Let’s Encrypt.
To communicate securely with the Security Team, please utilize our GPG key. It consists of several subkeys signed by an offline master key. Any recent version of GnuPG will support this kind of hybrid key. The current key structure is:
pub rsa4096 2015-11-24 [CE] [expires: 2023-09-18] 0148 3B31 D8F9 DBA2 5D41 4DAA 718E 9F6D 10EC 230B uid [ultimate] ISRG Security Team (letsencrypt.org) <email@example.com> sub rsa4096 2015-11-24 [E] [expires: 2019-09-19] sub rsa4096 2015-11-24 [A] [expires: 2019-09-19] sub rsa4096 2015-11-24 [S] [expires: 2019-09-19]
You can download the GPG Public Key here, or utilize your favorite key server.
The key fingerprint must match
0148 3B31 D8F9 DBA2 5D41 4DAA 718E 9F6D 10EC 230B.