A cyber attack in December that caused a shutdown of a portion of Ukraine’s electricity grid crossed a “Rubicon” in that it took offline critical infrastructure that civilian populations rely on, a senior Department of Homeland Security (DHS) official said on Wednesday.The blackout that hit in western Ukraine on Dec. 23 “was the first cyber attack bringing down critical infrastructure upon which civilian populations depend,” Suzanne Spaulding, under secretary for the National Protection and Programs Directorate at DHS, said at…
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