This is possible via a specially developed timing attack. The security researchers state that this makes it possible to determine the locations of users of popular instant messenger apps with more than 80% accuracy.
An anonymous blog reader has posted a link to the blog post Timing Attacks on WhatsApp, Signal, and Threema can Reveal User Location from Sven Taylor (thanks for the hint).īecause mobile Internet networks and the server infrastructure of instant messenger apps have specific physical characteristics that result in standard signal paths, these notifications have predictable delays that depend on the user's location.
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