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Which of these population tracking protocols is better from a cryptography point of view?

I have read a paper discussing some of the security concerns, but it does not go into much detail about the cryptographic technology involved.

For example, what happens if Bluetooth keys are compromised? Is revocation possible in practice? How is key generation performed in the first place? Are keys generated locally by each device?

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None of them is secure. Both include dramatic privacy risks:

  • PEPP-PT build a a central database with all social interactions
  • D3-PT allows for linking of infection reports to individuals:
    • Simply record all Rolling Proxymity Identifiers you see and there timestamps with a simple continuously scanning BLE device (e.g. Raspberry Pi)
    • Process this list against the infection warnings.
    • You now only need to match this timestamps with other transactions on entrances, point of sale, CCTV or logon
  • D3-PT also allows nation states to contact trace suspects by
    • injecting fake alerts in seized mobiles
    • suppressing alert display during risk analysis (like silent SMS work),
    • but using risk analysis to identify individuals
  • A similar technique can be used with active beacons to find out who was at a certain place at a certain time
  • Someone can relay (receive with an own device, transmit via internet anywhere, send out to somewhere else with an BLE extender) all broadcasts received near a covid test station to self quarantine anyone.
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  • $\begingroup$ Many thanks for providing this extra information to help me understand some of the security risks of these technologies. I'd still like more information about the security, besides theoretical attacks. $\endgroup$ – conchild Apr 26 at 20:58

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