Upcoming Features

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Multi-Perspective Validation

Currently Let’s Encrypt validates from a single network perspective. We are planning to start validating from multiple network perspectives.

ECDSA Root and Intermediates

Currently Let’s Encrypt only signs end-entity certificates with RSA intermediates. Let’s Encrypt will generate an ECDSA root and intermediates which can be used to sign end-entity certificates.

Completed Features

Certificate Transparency Log

  • Enabled: May 15, 2019

We are starting to operate a Certificate Transparency log.

TLS ALPN Challenge Support

  • Enabled: July 12, 2018

We’ve specified and implemented a replacement for the TLS-SNI validation method, which was discontinued for security reasons. Introducing a replacement was important for subscribers who only want to use port 443 for validation.

Embed SCT receipts in certificates

  • Enabled: March 29, 2018

Wildcard Certificates

  • Enabled: March 13, 2018

ACME v2 API

  • Enabled: March 13, 2018

IDN Support

  • Enabled: October 20, 2016

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

Full IPv6 Support

  • Enabled: July 26, 2016

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

  • Enabled: March 25, 2016

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

ECDSA Signing Support

  • Enabled: February 10, 2016

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

  • Enabled: January 20, 2016

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