As far as I know in these cases, it’s usually not a matter of breaking the encryption, it’s a matter of compromising one of the endpoint devices. If you can install some spy code on the computer/phone *running* whatsapp, then the encryption doesn’t matter. Sometimes law enforcement has the means, through a phone manufacturer or network provider, to get software pushed to a phone so that it can be monitored. And sometimes it can be installed by exploiting insecure software or hardware in the phone.
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