Sony's CEO, Howard Stringer, did several interviews today, with Bloomberg, the Financial Times, and the Wall Street Journal. He said that Sony is no closer to finding the culprit behind the attack, and is focusing on security challenges ahead. He told Bloomberg, "Nobody's system is 100 percent secure. This is a hiccup in the road to a network future." The PlayStation Network went down on April 20th, and only came back online on Saturday. Sony is still working to sort out issues with the Network and to regain its users' trust.