Who catches the IMSI catchers? Researchers demonstrate Stingray detection kit

IMSI catchers, devices used to spoof cell towers and intercept communications, are one of the most resented open secrets of law enforcement. Strict non-disclosure agreements prevent them from being acknowledged as existing, let alone being used — but researchers think they’ve found a way to spot the shady signal-snatchers.

The devices, colloquially called Stingrays after a common model, work by sending out signals much like cell towers do; cell phones connect, identify themselves and send information like texts and calls through the fake tower, creating a sort of mobile wiretap. Critics have argued that innocent people’s data is caught up in this dragnet, but law enforcement has been less than forthcoming owing to gag orders from the companies that provide…

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