alt Hacker NewsSignal > RCS > SMS.
Just because RCS can't be done without metadata doesn't mean it's a fruitless endeavor. Why not have someone use RCS to then get on Signal? That is so much better than plaintext SMS to Signal.
And for most people, RCS between Android <-> iOS is the biggest advancement in encrypted communication for the layman that I've seen since Let's Encrypt.
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That is a positive progression for sure. I guess it sounds like RCS is gatekept behind a play store API on the android side so there isn't an open source solution quite yet? Mostly I'm lamenting that even with signal there's meta-data you can infer behavior from. I know Session messenger has a bit of a network shuffle (is it garlic routing?) That blurs metadata collection a bit, but then they watered down several of Signals' security/privacy choices. I'm constantly curious and overwhelmed at the choice of text communication platforms, just so many!
We've announced our plan to add RCS with Messaging Layer Security (MLS) for E2EE compatible with Google Messages and iOS. SMS/MMS will only be a fallback once that's implemented.
Google Messages is essentially the only remaining RCS client for Android and it's the only one with end-to-end encryption. It already works on GrapheneOS via a toggle for ICC authentication extending our sandboxed Google Play compatibility layer. We want to add support for it to our own Messaging app but that's not straightforward since it's not at all an open platform even to the extent of SMS/MMS.