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RFC 9750
Title: The Messaging Layer Security (MLS)
Architecture
Author: B. Beurdouche,
E. Rescorla,
E. Omara,
S. Inguva,
A. Duric
Status: Informational
Stream: IETF
Date: April 2025
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 41
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-mls-architecture-15.txt
URL: https://www.rfc-editor.org/info/rfc9750
DOI: 10.17487/RFC9750
The Messaging Layer Security (MLS) protocol (RFC 9420) provides a
group key agreement protocol for messaging applications. MLS is
designed to protect against eavesdropping, tampering, and message
forgery, and to provide forward secrecy (FS) and post-compromise
security (PCS).
This document describes the architecture for using MLS in a general
secure group messaging infrastructure and defines the security goals
for MLS. It provides guidance on building a group messaging system
and discusses security and privacy trade-offs offered by multiple
security mechanisms that are part of the MLS protocol (e.g.,
frequency of public encryption key rotation). The document also
provides guidance for parts of the infrastructure that are not
standardized by MLS and are instead left to the application.
While the recommendations of this document are not mandatory to
follow in order to interoperate at the protocol level, they affect
the overall security guarantees that are achieved by a messaging
application. This is especially true in the case of active
adversaries that are able to compromise clients, the Delivery Service
(DS), or the Authentication Service (AS).
This document is a product of the Messaging Layer Security Working Group of the
IETF.
INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
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