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A federal agent said WhatsApp's encryption is a lie. Then the investigation was shut down
(www.techspot.com)
This is a most excellent place for technology news and articles.
even better - as far as I am aware the client isn't open (and even if it were, is your installed build from the same source?).
so, even if the keys are local only, who says there isn't a hidden API that simply sends locally decrypted content back to a remotely calling endpoint?
Or steganographically leaks back the keys ...