So there was a packet tool someone was working on for some time, but then he dropped off the project and released the source code. I've had great success in the past with finding exploits through tampering with packets, though I must admit I don't understand programming languages. I was hoping Alguigi, or someone else from the community could get it fixed up to run properly again.
Here is the link for the original program and it's source code:
http://www.2shared.com/file/omekCRW2/LoLAdvanced.htmlLike I said, keep in mind that it isn't currently functioning. (For whatever reason, I don't know.) But it should contain whatever method is used to decrypt the packets.
All credit for the code/program goes to the Skillhackers community, where ever it went.