Post-Quantum OpenMLS

Get started with post-quantum secure end-to-end encrypted with OpenMLS.

OpenMLS now offers security against harvest-now-decrypt-later (HNDL) quantum adversaries. In #1546 we merged support for the X-Wing KEM draft, which is an early draft for securely combining …

Post-Quantum Group Messaging

Get post-quantum security for end-to-end encrypted messaging with MLS.

With multiple post-quantum cryptographic algorithms (ML-KEM, ML-DSA) nearing standardization, enterprises, research groups, and standards bodies have started investigating what post-quantum secure …

Internet Defense Prize 2023

Cryspen co-founders win Usenix Security prizes

At the 32nd Usenix Security Symposium in Anaheim CA, a paper on the Messaging Layer Security Protocol, co-authored by our founders Jonathan Protzenko and Karthikeyan Bhargavan, was awarded both the …

Three (thousand) may keep a secret

An introduction to Messaging Layer Security

“Three may keep a secret, if two of them are dead.” - Benjamin Franklin (1735) However skeptical we may be of our human ability to keep secrets, we still routinely participate in group conversations …

MLS - RFC 9420

A new standard for secure messaging

✨ We are thrilled to announce the release of the MLS specification as RFC 9420. RFC 9420 is a comprehensive description of the first standardised, efficient, asynchronous, key establishment protocol …

OpenMLS

Practical Group Key Agreement for Messaging and more

Messaging Layer Security (MLS) is a security layer for end-to-end encrypting communication in large dynamic groups. It has been specified by the IETF MLS working group and designed to be efficient, …

OpenMLS

We have joined forces with our friends from Phoenix R&D to improve OpenMLS. The MLS protocol draft is in the IETF working group’s last call and is thus on track to become an RFC soon. We …