Upcoming Features

ECDSA Intermediates

Let’s Encrypt only signs end-entity certificates with RSA intermediates. We will add the ability to have end-entity certs signed by an ECDSA intermediate.

Completed Features

IDN Support

Let’s Encrypt now supports issuance for Internationalized Domain Names (IDNs).

Full IPv6 Support

Initially, only parts of the Let’s Encrypt API infrastructure could communicate via IPv6. This prevented IPv6-only systems from being able to fully interact with Let’s Encrypt. This has been resolved - IPv6 support has been enabled for all functionality.

Windows XP Certificate Compatibility

Resolved an issue with our certificate chain that prevented Let’s Encrypt certificates from being accepted by browsers on Windows XP.

ECDSA Signing Support

Added the ability for Let’s Encrypt to sign ECDSA keys with Let’s Encrypt’s RSA intermediates. Support for signing ECDSA keys with a full ECDSA cert chain will be added later.

ACME DNS Challenge Support

Let’s Encrypt allows validation via DNS records as defined in the ACME specification.