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this post was submitted on 10 Dec 2023
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Android
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Thought RCS used the Signal Protocol?
Edit for source: Technical paper: Messages end-to-end encryption
It's not natively supported by the base RCS standard, in the section at the end of the paper in the section titled "Third Party RCS Clients" Google explains that they've built the e2ee their Messages app themselves, (on top of standard RCS).
A developer has to use Google's implementation specifically in order to send and recieve e2ee messages to Google's Messages app (and Samsung Messages who also implemented this recently)
Although the e2ee implementation is using the Signal protocol under the hood, it's for message content only - this is what is transmitted in cleartext (taken from the paper)
Without using this implementation of the Signal protocol on top of RCS, the message will deliver to the contact's phone, but shows up as unencrypted garbled text
That is a very useful resource though, never knew there was a paper available on the implementation. Saving 😁