Re: Google enables end-to-end encryption for Android’s default SMS/RCS app – Ars Technica

https://arstechnica.com/gadgets/2021/06/google-enables-end-to-end-encryption...

https://www.gstatic.com/messages/papers/messages_e2ee.pdf While it may be e2e, it's not strictly old school SMS. Though perhaps slow inefficient unreliable costly censorable tracked recorded etc, SMS can definitely be used to carry encrypted messages, including the KEX protocols if not using PSK. But where are the opensource apps that are hooking into strict raw SMS to do just that?