Ding dong, the SMS is dead.

Apple has announced that its Messages app will support the RCS messaging standard in iOS 18. RCS offers more advanced features compared to traditional SMS, including higher-quality media, typing indicators, and end-to-end encryption. This move will improve messaging between iOS and Android devices, which currently rely on the less capable SMS protocol. Apple’s decision to add RCS support likely comes in response to pressure from Google, Samsung, and European regulators who have pushed for better cross-platform messaging. Overall, this change will bring the iPhone’s messaging capabilities more in line with the Android experience.

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  • Skull giver@popplesburger.hilciferous.nlEnglish
    0·
    5 months ago

    Neither is proprietary, but Google doesn’t document how they implement either of them. Signal’s normal protocol is intended for use with a direct client-server connection, but Google wrapped it into a different message transport (RCS, which is just a predefined set of HTTP calls with lots of XML).

    They do some sort of base64 encoding to transport the messages themselves, but they don’t document what key servers are in use, how registration works, or how key material is exchanged with those servers. Do they use RCS to communicate with key servers? Do they require a direct internet connection? What about video calls, are they done through standard RCS or do they add encryption there? Do they exchange the encryption keys for video calls through RCS as well? How do keys work if you deregister from Google Jibe and register RCS with your own carrier?

    Lots of open questions here. All stuff that can be reverse engineered. I’m sure plenty of companies are trying to figure out how Google RCS works.

    I hope Google switches to full MLS (if they haven’t already, they won’t say!) and implement MIMI for secure cross platform messaging once it’s been finalised, but there’s no way of knowing right now.

    • unwaveringegg@endlesstalk.orgEnglish
      0·
      5 months ago

      It’ll probably take several years for them to switch over to MLS. Hopefully other messaging apps like Telegram and Threema can also utilize it just for crossplatform purposes.

      • Skull giver@popplesburger.hilciferous.nlEnglish
        0·
        5 months ago

        I don’t think Telegram will switch to MLS, they haven’t bothered encrypting group chats before and they’re (strangely) defensive of their MTProto encryption layer.

        I’m not sure how Threema’s security works, but it’d be nice if they could add a compatibility layer for external chat services.