Sonys online gaming platform, The PlayStation Network (PSN), disappeared for more than a month starting in April. The reason? A massive attack on the network knocked the gaming giant offline and exposed the data of more than million users worldwide. The system was brought back online at the end of May, but the company was left with $170 million in clean-up costs and few solid leads regarding the perpetrators. Speculation has run the gamut, from Anonymous hackers to disgruntled ex-employees.”]