The Let's Encrypt Client (now called certbot) is a tool to automatically receive and install X.509 certificates to enable TLS on servers. The client will interoperate with the Let's Encrypt CA which will be issuing browser-trusted certificates for free. See README.Slackware for more detailed instructions. Note: the certificate client tool is now certbot, but a symlink is provided to be backward compatible with previous letsencrypt version. Please rename the script to the new name: certbot Since 1.1.0, most of deps must be (re)built against Python3.