3 ms·

I wonder if good E2E encryption of the WhatsApp message rules out the app sending, in parallel, an indexed list of juicy keywords (encrypted or not) to FB serve

• r00fus 10y ago
  So you're saying the client indexes your words locally and then e2e encrypts and sends to the person whom you're conversing with? Is that feasible client-side without burning all your battery?
  • tremon 10y ago
    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/Carroll.pdf https://www.usenix.org/event/usenix10/tech/full_papers/Carro...
    • r00fus 10y ago
      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)?