Earlier quoted context omitted.
It also says it might have been, which is much more worrying to me than the lack of evidence; because before this sony had no evidence that their network was compromised. This whole thing seems like a great example of incompetence.
This compromise happened DAYS ago. Google was hacked by China in mid-December 2009 they didn't publicly announce what happened until January 12, 2010. What started to look like a harmless intrusion turned into compromised gmail accounts turned into a highly sophisticated attack on Chinese dissidents turned into a full scale assault on their infrastructure. People were still figuring out the extent of that attack a co…
It's one thing to be attacked by determined people and fail eventually -- given enough time, everyone does -- but it's a completely different matter to give the keys to the castle to anyone with a rooted PS3.