Google Find My Device unknown tracker alert algorithm?
I was reading Google's blueprint about their new technology called Find My Device and what took my interest was unknown tracker identification and how Google does that.
Unknown tracker alerts. The Find My Device network is also compliant with the integration version of the joint industry standard for unwanted tracking. Being compliant with the integration version of the standard means that both Android and iOS users will receive unknown tracker alerts if the on-device algorithm detects that someone may be using a Find My Device network-compatible tag to track them without their knowledge, proactively alerting the user through a notification on their phone.
Does anybody know how it is implemented except location data send rate limiting and throttling? My understanding is that any person that passes by the phone owner and has enabled "Find my Device" function will be treated by Google as a potential spy that tracks its victim, which in fact is not true. In very crowded places like airports and train stations this approach may generate a lot of noise and hide real unknown tracking from the legitimate users of the Find My Device network. The density of signals in such areas can be very verbose and not useful. Any idea how identifies malicious from non-malicious actors?
P.S. Yes, I've read Unknown tracking draft specification Google is referring to in its blog, but it is written in a very clumsy language so I wasn't able to get this chunk of information. I'd be grateful if anybody can point out the necessary chapter of this draft where this algorithm is described. Not to mention we have no idea if Google fully adhered to this spec.
