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Google turns to regulators to make Apple open up iMessage
(www.theverge.com)
This is a most excellent place for technology news and articles.
Isn't this trivial to check by decrypting network traffic sent from a device? Security researchers probably already tried to find any flaw they could.
And to add to this, Google published a technical overview for signal implementation in RCS: https://www.gstatic.com/messages/papers/messages_e2ee.pdf