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Nothing Phone builds a blue bubble iMessage bridge while Google and Apple fight over RCS
(www.androidcentral.com)
this post was submitted on 14 Nov 2023
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They might be able to relay them in a way that the end to end encryption is actually handled on the phone and the relay only relays encrypted messages.
That would likely still give them a capability to MitM but it's plausible that they couldn't passively intercept the messages.
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Absolutely. The iMessage network isn’t some unknowable beast, it “just” requires an Apple device be involved and activated to work. In order to spoof that far, you’d essentially need to emulate quite a bit on device.
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If it's anything like Beeper 's Matrix bridge then it's E2EE Matrix encrypted between your device and the bridge server and then using Apple's iMessage encryption between the bridge server and Apple/the other user.
The weak point is always going to be the bridge software as by necessity the message must be decrypted there to re-encrypt for iMessage.
At least in Beeper/Matrix the bridge software is open source and one can host their own bridge while continuing to use the existing Beeper/Matrix main server.
Doing so gives you no-trust security since the Beeper/Matrix host cannot decrypt the messages between you and the bridge you control and rubbing your own bridge eliminates that weak point.