I was under the impression that this is a 'proprietary' extension between Google devices, and that there was no RCS-standard-based E2EE:
> The RCS specification defines several types of messages. Our implementation of E2EE uses varying strategies for encrypting each type of message to maximize user privacy while still adhering to the RCS specification.
I was under the impression that this is a 'proprietary' extension between Google devices, and that there was no RCS-standard-based E2EE:
> The RCS specification defines several types of messages. Our implementation of E2EE uses varying strategies for encrypting each type of message to maximize user privacy while still adhering to the RCS specification.
* https://www.gstatic.com/messages/papers/messages_e2ee.pdf
They use "vnd.google.rcs.encrypted" in the Content-Type header.