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"You draw six circles, and the intersection of those six circles will be the location of the targeted person," says Hoang.
But after a slightly longer hunting process, Hoang was still able to identify my location.
And Jack'd, despite claims to "fuzz" its users' locations, allowed Hoang to find me using the older simple trilateration attack, without even the need to spoof dummy accounts.
Ten minutes after that, he sent me a screenshot from Google Maps, showing a thin arc shape on top of my building, just a couple of yards wide. Hoang says his Grindr-stalking method is cheap, reliable, and works with other gay dating apps like Hornet and Jack'd, too.
(He went on to demonstrate as much with my test accounts on those competing services.) In a paper published last week in the computer science journal Transactions on Advanced Communications Technology, Hoang and two other researchers at Kyoto University describe how they can track the phone of anyone who runs those apps, pinpointing their location down to a few feet.