woman code named lina, a former sony employee. he says lina has ties to the hacking group guardians of peace, which claimed responsibility for the sony hit. she was a security staffer with sony who had what he calls super user access to the company s cyber secrets, user names and passwords to critical systems. he says lina had two motives for the hack. first of all, how sony treated its employees, layoffs that were going on, but also a bigger issue around piracy and how sony was treating those who had pirated music, had been and movies and other content and how they had been prosecuted in the u.s. and other countries. reporter: experts have doubts about north korea s ability to carry out such sophisticated attack. it s beyond the skill level we ve been able to observe. reporter: but if north korea did commit the hack, analysts say it would have been done by a