Google Messages to Integrate MLS Protocol for Cross-Platform End-to-End Encryption

If you use Google Messages as your default SMS app, this update is crucial! Recently, Google Messages announced its plan to integrate the Messaging Layer Security (MLS) protocol into the app. This integration could potentially bring cross-platform end-to-end encryption, enabling secure communication between major messaging platforms.

In case you’re wondering about MLS, let me explain it to you briefly.

European regulators have been encouraging tech companies to adopt end-to-end encryption systems that facilitate secure messaging across different platforms. This concept is known as “Messaging interoperability.” The concept of messaging interoperability aims to enable sending messages to individuals without needing to know or be concerned about the specific chat service they use. The goal is to make instant messaging function similarly to email, where each person can use their preferred service and app, yet still communicate seamlessly with others.

For instance, I can send you a message via WhatsApp, and you can receive it on Telegram. Alternatively, someone might send you a Facebook Message, and you’ll be able to receive it on Telegram. Similar to email, you and I can exchange messages with each other, regardless of the service or platform we use.

Google is actively pursuing this goal through the Messaging Layer Security (MLS) protocol. In case you’re unfamiliar, MLS is a protocol developed by the Internet Engineering Task Force (IETF), and its specification RFC 9420 has recently been approved for publication. With MLS, Google aims to achieve a higher level of messaging integration and enhance the cross-platform communication experience.

According to Google, the new MLS specification enables “practical interoperability across services and platforms, scaling to groups of thousands of multi-device users.” With MLS, Google Messages can establish end-to-end encryption, facilitating seamless and secure communication not only within its own app but also with other messaging platforms that support MLS.

A report by The Verge emphasises that achieving meaningful interoperability requires major companies to support a common standard, and MLS seems to have garnered support from one of the largest players, including Google. Alongside MLS, Google also supports RCS, a carrier-backed end-to-end encrypted messaging system. Notably, earlier versions of RCS lacked adequate security for group chats, but Google is now introducing an enhanced version with improved security measures that do not rely on MLS.

The company has shown its dedication to integrating MLS into Google Messages and encouraging its widespread adoption throughout the industry. As part of this commitment, the company has open-sourced its MLS implementation in the Android codebase. By incorporating MLS into Google Messages, users will be able to participate in secure group chats. These encrypted messages will effortlessly reach recipients on their preferred messaging apps across various devices.

At this point, it remains uncertain how this integration will unfold, particularly regarding whether RCS messages will work seamlessly with the MLS-based encryption. Innovation Village will keep you informed with further details as the story builds.