hello, great presentation!iam a grad student in canada and working on distributed security for web services.iam thinking of a PKI based protocol where you dont need to share any previous information with communicating agents.in WS trust,the client is authenticated thru his drivers license # but what of situations where u know nothing about each other?no trusted party?anyone apart from Vitorrio can contact me thru honeyramzy@gmail.com for assistance.thanks