This is what the culprit had to say. I personally dont agree with his/her methods.

Welcome followers and supporters of FamedGod. Over the past 9 hours many are wondering why such events have occurred to the playstation network. Sony is a company that lacks the security which makes every user vulnerable to having their information leaked. Jailbreaks can access hidden and prohibited content now. Memory dumping can reveal the hidden servers which personal and main information is stored. Simple hex converting and decryption lead to a full DDoS on playstations main server data center. Please understand, I am here to show, that you as a corperate company are vulnerable. Sony You just launched a new system on a new network but it all leads to the same server. How more vulnerable could you make your network? Take advise from microsoft and their ways of security. They know what they're doing and have the security to prevent most attacks.This took little to no effort to preform such an attack. The funny thing is that you still allow people to access the network on these jailbroken consoles. If you really wanted to remove them from your network entirely, you would drop the current network and forge all the information to a new and well secured network making it impracticle to mod the next. The fact you cant even stop the sign in from modded firmware is ridiculous. You apparently, didnt solve a thing when you went down for a month. I hope you think twice next time.