Apple Secures the “Green Bubble”: iOS 26.5 Brings End-to-End Encryption to RCS
Apple has begun the rollout of iOS 26.5, a pivotal update that finally introduces end-to-end encryption for RCS (Rich Communication Services) messaging between iPhone and Android users. This move addresses a long-standing security gap, ensuring that cross-platform conversations are no longer transmitted in plaintext.
The implementation of this security layer is a significant step toward parity between iMessage and RCS. While iMessage has utilized end-to-end encryption since 2011 and Google Messages provided similar protections for Android-to-Android chats, the interoperability introduced with iOS 18 in September 2024 initially lacked this critical privacy feature. The arrival of encrypted RCS on iOS 26.5 means that “green bubble” conversations can now achieve a level of security comparable to “blue bubble” exchanges.
Technically, the solution is built upon the GSMA Universal Profile 3.0 and the Messaging Layer Security (MLS) protocol. MLS is an open standard co-developed by Apple and Google, designed to facilitate the exchange of encryption keys without requiring either company to act as an intermediary. This collaborative approach highlights a growing industry trend toward standardized, secure interoperability in digital communications.
For users, the transition is designed to be seamless. Encryption is enabled by default on iOS without requiring manual configuration. When both the iPhone and Android users meet the necessary requirements—which includes having the latest version of Google Messages on the Android side—a lock icon will appear in the chat thread to signify that the session is secure. However, the feature can be disabled by the user if preferred.
Despite the advancement, the rollout is not universal. Apple has noted that the feature depends on “supported operators,” meaning the availability of encrypted RCS will vary based on the carrier’s adoption of the new standard. This initial beta release does not yet extend encryption to group conversations and metadata—such as timestamps and participant identities—continues to be transmitted without encryption.
The security update arrives as part of the broader iOS 26 ecosystem, which has introduced a comprehensive visual overhaul known as “Liquid Glass.” This new design language emphasizes fluidity and optical glass qualities across the Lock Screen, Home Screen, and Control Center. Beyond aesthetics, iOS 26 has integrated “Visual Intelligence,” allowing users to take action or ask questions based on on-screen content, alongside new communication tools like Live Translation for Messages, FaceTime, and Phone calls.
With the release of iOS 26.5 and its encrypted RCS capabilities, Apple is effectively closing a primary vulnerability in the modern SMS replacement, signaling a commitment to privacy that extends beyond its own walled garden.
