RCS Messaging Adds End-to-End Encryption Between Android and iOS

The GSM Association has released new specifications for RCS messaging incorporating end-to-end encryption (E2EE) based on the Messaging Layer Security protocol, six months after iOS 18 introduced RCS compatibility.

The specifications ensure messages remain secure between Android and iOS devices, making RCS 'the first large-scale messaging service to support interoperable E2EE between client implementations from different providers,' said GSMA Technical Director Tom Van Pelt.

The system combines E2EE with SIM-based authentication to strengthen protection against scams and fraud. Apple confirmed it 'helped lead a cross industry effort' on the standard and will implement support in future software updates without specifying a timeline. Google's RCS implementation has featured default E2EE since early 2024.

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