Disclaimer

This is a DEVELOPER PREVIEW intended for developers and testers only.

DO NOT RUN THIS CODE ON A PRODUCTION SERVER. IT WILL INSTALL CERTIFICATES SIGNED BY A TEST CA, AND WILL CAUSE CERT WARNINGS FOR USERS.

Browser-trusted certificates will be available in the coming months.

For more information regarding the status of the project, please see https://letsencrypt.org. Be sure to checkout the Frequently Asked Questions (FAQ).

About the Let’s Encrypt Client

In short: getting and installing SSL/TLS certificates made easy (watch demo video).

The Let’s Encrypt Client 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.

It’s all automated:

• The tool will prove domain control to the CA and submit a CSR (Certificate Signing Request).

• If domain control has been proven, a certificate will get issued and the tool will automatically install it.

All you need to do to sign a single domain is:

user@www:~$ sudo letsencrypt -d www.example.org auth

For multiple domains (SAN) use:

user@www:~$ sudo letsencrypt -d www.example.org -d example.org auth

and if you have a compatible web server (Apache or Nginx), Let’s Encrypt can not only get a new certificate, but also deploy it and configure your server automatically!:

user@www:~$ sudo letsencrypt -d www.example.org run

Encrypt ALL the things!