Messaging Layer Security

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Messaging Layer Security (MLS), is a security layer for end-to-end encrypting messages in groups of size two to many. It is being built by the IETF MLS working group and designed to be efficient, practical and secure.[1][2][3]

Security properties[edit]

Security properties of MLS include message confidentiality, message integrity and authentication, membership authentication, asynchronicity, forward secrecy, post-compromise security, and scalability.[4]


The idea was born in 2016 and first discussed in an unofficial meeting during IETF 96 in Berlin with attendees from Wire, Mozilla and Cisco.[5]

Initial ideas were based on pairwise encryption for secure 1:1 and group communication. In 2017, an academic paper introducing Asynchronous Ratcheting Trees was published by University of Oxford setting the focus on more efficient encryption schemes.[6]

The first BoF took place in February 2018 at IETF 101 in London. The founding members are Mozilla, Facebook, Wire, Google, Twitter, University of Oxford, and INRIA.[7]


  1. ^ "Inside MLS, the New Protocol for Secure Enterprise Messaging". Dark Reading. Retrieved 2019-11-15.
  2. ^ at 10:29, Richard Chirgwin 22 Aug 2018. "Elders of internet hash out standards to grant encrypted message security for world+dog". Retrieved 2019-11-15.
  3. ^ "Messaging Layer Security". GitHub.
  4. ^ "Messaging Layer Security (mls) -". Retrieved 2019-03-05.
  5. ^ "Das sind die sieben Entwickler-Trends 2019: Vom Java-Comeback über MLS bis KI/ML-zentrierte Technologien". IT Finanzmagazin. 2 January 2019. Retrieved 7 January 2019.
  6. ^ Cohn-Gordon, Katriel; Cremers, Cas; Garratt, Luke; Millican, Jon; Milner, Kevin (2017). "On Ends-to-Ends Encryption: Asynchronous Group Messaging with Strong Security Guarantees". Cite journal requires |journal= (help)
  7. ^ Chirgwin, Richard (22 August 2018). "Elders of internet hash out standards to grant encrypted message security for world+dog". Retrieved 30 November 2018.