You mean prox data right?
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Replying to @Pinboard
The Google|Apple protocol and many others are recording proximity events between devices, and no location data. This data is private until a user releases it for others to match against their own logs on their own devices to see if they've been exposed.
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Replying to @durumcrustulum
That part I understand. But I still don't understand your question. Sorry to be thick.
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Replying to @Pinboard
> Assumes location data is dispensible There is no location data, only prox data. Maybe by correlating with other BLE prox data that _does_ log location, you have location data to dispense but that's outside the scope of these designs.
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Replying to @durumcrustulum @Pinboard
Things we do have to worry about: BLE loggers that slurp up the positive broadcasts and correlates that with say, someone who was in your store, and you start keeping a list of COVID+ people to advertise crap at.
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Replying to @durumcrustulum
My point is that the location history, not proximity tracing may be the essential thing for the public health response. Or it may be that proximity data is enough, or at least good enough given the privacy tradeoff. The answer is not obvious and needs testing, is my argument
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Replying to @BradRubenstein @durumcrustulum
I'm going to charitably guess that Apple and Google were smart enough to include epidemiologists in the design of this.
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FWIW, it does seem so. Narrowing in on Bluetooth was one of the main conclusions from the https://www.pepp-pt.org research with epidemiologists. The bounding grid formed by location turns out to be quite big and error-prone. BLE much more localized.
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Better link: https://docs.google.com/document/d/16Kh4_Q_tmyRh0-v452wiul9oQAiTRj8AdZ5vcOJum9Y/edit … . GPS and cell tower data can be off, e.g. around tall buildings and would generate a lot of matches who you're not that close to. Of course disclosing location for tracing history is a seperate argument than whether its suitable for matches.
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