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this post was submitted on 20 Jul 2023
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rcs is not e2e encrypted afaik
The Google implementation of rcs is E2EE.
Not necessarily. Google has implemented E2EE in their implementation, but it only works if both parties are using Google Messages. It's not a standard part of the spec.
I too could manually encrypt data and send it via regular old sms. That would require the other party to know of and make use of extra tools to be able to read and reply. If not, then they might not be able to read the message, or worse, reply in plaintext. That's what google is doing with rcs. Rcs is not encrypted. the google app encrypts the data and sends it "unencrypted" over rcs. From rcs' point of view it looks like "this user is trying to send random junk.... who am I to judge?"