By the way I checked wiki's article regarding PerfectDark and according to one ref. it's been "deciphered:
"There also came the news that Perfect Dark has been deciphered by NetAgent, which allegedly has the capability to determine encrypted information such as IP addresses, port numbers, keywords, version numbers of clients, and even file names, file sizes, cache creation dates and ratings from the public nodes.[3]"
I checked the ref but it's in Japanse. Any info about this?
Link from Wiki:
http://forensic.netagent.co.jp/pd_chosa.html