Bluetooth contact tracing and how to fuck with it.
These bluetooth dongles and phone apps surely can't create a secure connection between devices - it would take far too long I would think. Even if it did, they would have to have a pre-shared 4 digit PIN (at least with legacy pairing). A brute force attack on one might be a brute force attack on all.
Then simply have a rotating value for each connection and walk about.
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