Quarantined-TreeKEM: a Continuous Group Key Agreement for MLS, Secure in Presence of Inactive Users

ePrint Report: Quarantined-TreeKEM: a Continuous Group Key Agreement for MLS, Secure in Presence of Inactive Users

Céline Chevalier, Guirec Lebrun, Ange Martinelli

The recently standardized secure group messaging protocol “Messaging Layer Security” (MLS) is designed to ensure asynchronous communications within large groups, with an almost-optimal communication cost and the same security level as point-to-point secure messaging protocols such as “Signal”. In particular, the core sub-protocol of MLS, a Continuous Group Key Agreement (CGKA) called TreeKEM, must generate a common group …

asynchronous communication communications continuous eprint report key large martinelli messaging mls presence protocol report security