Google to foster interoperable encrypted communication across messaging platforms with MLS protocol

Google has revealed its intention to foster interoperable end-to-end encrypted communication across major messaging platforms. The company plans to incorporate the Message Layer Security (MLS) protocol into Google Messages and Android, in line with its support for regulatory initiatives promoting interoperability in messaging platforms, possibly driven by the EU's Digital Markets Act.

Interoperability in these platforms requires the adoption of open, industry-approved standards, particularly concerning privacy, security, and end-to-end encryption. Without such standards, encrypted group messaging and advanced features could face significant hurdles. The Internet Engineering Task Force's MLS specification RFC 9420 is seen as vital for facilitating interoperable end-to-end encrypted messaging, offering efficient group key establishment, forward secrecy, and post-compromise security for various group sizes.

Google asserts that MLS will enable practical interoperability across diverse services and platforms, serving thousands of multi-device users. The protocol's flexibility allows it to tackle potential privacy and security threats, including quantum computing. Google's strategy involves integrating MLS into its Messages app, promoting its broad industry adoption by open-sourcing the implementation in the Android codebase. The impact on Rich Communication Services (RCS) is unclear. However, the adoption of MLS could create new opportunities for users and developers of interoperable messaging services.