You can download the source code for these posts here . In his book, “ Programming WCF Services ”, Juval Lowy does a superb job of explaining the principles of WCF Security and simplifies the subject by discussing 4 typical security scenarios. I implemented those scenarios as demos for my latest class in WCF and I would like share them with you in this and the next few posts. Why should you read on? These demos are concise yet complete. My approach has been to use configuration files only - no code...