For an app to provide end-to-end encryption, it needs an extra layer of cryptography that sets up encryption keys among the devices participating in a conversation, so that these devices can encrypt users’ data in a way that cloud services can’t decrypt. Before MLS, there was no open, interoperable specification for this extra layer. MLS fills this gap, providing a system that is completely specified, formally verified, and easy for developers to use.
Google already said they will support this protocol.
In a move towards enhancing user privacy and security, Google has officially announced its support for the Messaging Layer Security (MLS) protocol for its Messages app. Google has always hoped that Apple can add support for Rich Communication Solutions (RCS). However, the company has now turned its attention to the Message Layer Security (MLS) protocol. It is hoping to increase the cross – platform link and convince Apple to make changes in iMessage.
I could see the GSMA adopting IETF’s Message Layer Security for E2E Encryption.
Google already said they will support this protocol.