In South Korea in March, more than 30,000 computers and servers at the country's two largest broadcasters, one cable channel and three banks out of commission. For hours, customers could not take out money from their accounts. After first pointing fingers at North Korea, and then China...the confused South Korean Communications Commission said it was difficult, maybe impossible to identify the perpetrators. But one man, Jaime Blasco, says he was able to identify the hackers as originating in China. And his words carry weight. He is one of the world's most experienced private investigators of cyber attacks. Born in Spain and now working in the United States, his clients include several governmentsin Europe as well as corporations in banking, energy, defense and telecommunications who turn to him in emergencies.