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 is being specified by the IETF MLS working group and designed to be efficient, practical and secure.

OpenMLS is the most widely used implementation of MLS in Rust. It has a safe and easy-to-use interface that hides the complexity of the underlying cryptographic operations.


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Related Posts

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Post-Quantum 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 elliptic-curve-based Diffie-Hellman with ML-KEM.
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Post-Quantum Group Messaging

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 protocols should look like and what properties they should satisfy.
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Internet Defense Prize 2023

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 Distinguished Paper Award and the prestigious Internet Defense Prize.
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Three (thousand) may keep a secret

“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 that we would like to keep away from prying eyes.
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MLS - RFC 9420

✨ 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 with forward secrecy and post-compromise security for groups in size ranging from two to thousands.
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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.