http://certbot.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/fa/pages/privacy
Certbot never transmits the private key associated with your certificate to the CA, EFF, or anyone else. Certbot may also ask you to provide information to EFF, such as your contact information, bug reports or information to help with technology research, which generally will not include personally identifiable information.