Cell phone surveillance countermeasure.

Researchers have created a device using off-the-shelf components that can sniff out controversial cell phone surveillance devices, known as IMSI-catchers or StingRays, used by federal and state law enforcement as well as hackers.
The International Mobile Subscriber Identity-catchers have not only been used to locate mobile devices but also to sometimes eavesdrop on users, send spam or upload malware, according to University of Washington (UW) security researchers.

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