seoul north korea probably steal south korean warship blueprint hack daewoo shipbuilding marine engineer co ltd 042660.ks database april last year south korean opposition lawmaker say tuesday north korea often implicate cyber attack south korea elsewhere pyongyang either ignore deny accusations hack almost 100 percent certain north korean hackers behind hack steal company sensitive document kyung dae-soo main opposition liberty korea party tell reuters telephone daewoo shipbuilding build several south korean warships include aegis-class vessel submarine likely north korea obtain blueprint say hack discover division south korea ministry defence charge investigate case cybercrime say kyung receive brief investigation sensitive classify seize document know disclose investigative team add spokeswoman daewoo shipbuilding say unaware issue early tuesday company process confirm detail kyung remark investigative team come conclusion north korea hack daewoo shipbuilding hack method similar attack north korea think behind kyung say hackers north korea believe responsible recent cyber heist taiwan late string hack target global swift message system early month another south korean lawmaker say north korean hackers steal large number classify military document include south korea-u.s. wartime operational plan british authorities say last week believe north korea behind wannacry ransomware attack may disrupt businesses government service worldwide include national health service england north korea hack daewoo shipbuilding take warship blueprint south korea lawmaker