I\'ve been doing a lot of studying and work recently related to WCF, web services and distributed computing in general, but most of the security concepts go over my head. Transp
Start with searching wikipedia for Public Key Infrastructure (PKI) and follow the links to understand the different pieces. You don't need to know the encryption algorithims for the various ciphers, but you do need to understand the concepts if you want to really understand how WCF uses it.