washington russian government-backed hackers steal highly classify u.s. cyber secrets 2015 national security agency contractor put information home computer two newspapers report thursday report first wall street journal cite unidentified source theft include information penetrate foreign computer network protect cyber attack likely view one significant security breach date late story washington post say employee work nsa tailor access operations unit elite hackers fire 2015. nsa decline comment cite agency policy never comment affiliate personnel issue reuters able independently verify report confirm hack would mark late series breach classify data secretive intelligence agency include 2013 leak data classify u.s. surveillance program contractor edward snowden another contractor harold martin await trial charge take classify nsa material home washington post report martin involve newly disclose case republican u.s. senator ben sasse member senate arm service committee say statement respond journal report true detail alarm nsa need get head sand solve contractor problem sasse say russia clear adversary cyberspace afford self-inflicted injuries tensions already high washington u.s. allegations surge hack american target russians include target state election agencies hack democratic party computers bid sway outcome 2016 presidential election favor republican donald trump cite unidentified source journal post also report contractor use antivirus software moscow-based kaspersky lab company whose products ban u.s. government network last month suspicions help kremlin conduct espionage kaspersky lab strongly deny allegations russian government officials could use flaw kaspersky software hack machine question security experts tell reuters could also intercept traffic machine kaspersky computers kaspersky say statement thursday find catch middle geopolitical fight kaspersky lab provide evidence substantiate company involvement allege incident report wall street journal say unfortunate news coverage unproven claim continue perpetuate accusations company department homeland security sept. 13 ban kaspersky products federal network u.s. senate approve bill ban use federal government cite concern company may pawn kremlin pose national security risk jam lewis cyber expert washington-based center strategic international study say report breach sound credible though firsthand information transpire baffle part able get stuff build use kaspersky despite work lewis say say intelligence agencies consider kaspersky products source risk years democratic senator jeanne shaheen lead call congress purge kaspersky lab products government network thursday call trump administration declassify information threats pose kaspersky lab disservice public national security continue withhold information shaheen say statement russian hackers steal u.s. cyber secrets nsa media report