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A comment on Is Facebook eavesdropping on phone conversations?. Parent comment

Re:Is Facebook eavesdropping on phone conversations? by tremon on Wednesday May 25, 2016 @08:01AM (#11769110)
The cpu is not the most power-consuming component of your device: the radio and display both consume more power than the processor. According to [1], the cpu typically accounts for only 10%-20% of power usage.

However, a secondary stream from the app to a different endpoint would be detectable, so there are other practical challenges to the GP's scenario.

[1] https://www.usenix.org/event/usenix10/tech/full_papers/Carro...

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Re:Is Facebook eavesdropping on phone conversations? by r00fus on Wednesday May 25, 2016 @01:59PM (#11771748)
Couldn't it be a secondary stream to the same endpoint but using a different keying (ie, encryption with server's pubkey) mechanism (the metadata then wouldn't be E2E encrypted, but that's not covered in WhatsApp's E2E security page)?
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