Authenticated and Encrypted RPC

This example shows how to implement Remote Procedure Calls which are authenticated and encrypted individually for each user and connection session.
The example also shows how to retrieve the user name from within the called method.

Communication using Secure Remote Password protocol

Simple example showing how to implement secured communication using the SRP protocol.

Simple Authentication when Connecting Service

Simple example showing how to implement authentication when connecting a service.

Windows Security Wiki

A useful summary about Windows Security.

Digital Signature

Summary: A short explanation what is digital signature and how it works.

Windows Phone 7: How to Encrypt Communication with Desktop Application

Summary: Simple example showing how to implement encrypted communication between Windows Phone 7 and standalone .NET application.
CodeProject

SSL Communication Between Applications

Summary:
The article shows the step by step procedure how to create the self signed certificate and how to configure the SSL connection. The example then implements the Https client server communication with using Eneter.Messaging.Framework.
CodeProject