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A comment on Smartphones with Qualcomm Chip Share Private Information with US Chip-Maker. Parent comment

Re:Smartphones with Qualcomm Chip Share Private Information ... by codebje on Tuesday April 25, 2023 @05:23PM (#35706937)
One I could think of is you could use accelerometer data to know if the phone is moving, and how: is it just being lifted and interacted with, is the user walking or running, are they in a car.

For a high profile target you might also be able to track their approximate location if you know their starting point and their acceleration profile - speed up, slow down, turns, time taken. Enough, at least, to execute an ambush.

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Re:Smartphones with Qualcomm Chip Share Private Information ... by AlotOfReading on Tuesday April 25, 2023 @06:12PM (#35707429)
With enough data and a high SNR, you don't even need the starting point or the velocity profile. Just the turns and distances are enough in combination with a map to uniquely identify most journeys. The problem with applying that more globally is sensor drift.
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