How to protect yourself from hackers
How to protect yourself from hackers 02:25

Washington (CNN)The Department of Homeland Security has confirmed that it has detected evidence of mobile snooping devices around Washington, DC.

The devices could be the work of foreign governments or entities, however, DHS hasn’t determined their origin, the agency said in a letter. At issue are what are known alternatively as Stingrays, IMSI catchers or cell-site simulators. The devices essentially act as fake cellphone towers, and as mobile devices connect to them, the devices are able to snoop on the traffic that goes through.

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