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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.
Google SAYS they use the Signal protocol.
Without open-source applications, you have to trust these companies to do the right thing when they can track you and make money from it in every single step of the way. Same goes for Meta with Whatsapp.
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