To design, develop, and deploy secure Web services, architects and developers must learn new technologies, and consider new threats associated with exposing functionality on potentially hostile networks. To prepare you to meet these challenges (both now on Web Service Enhancements 3.0 and in the future with Windows Communication Foundation), patterns & practices has created the Web Service Security guide. This guide provides a scenario-driven approach to demonstrate where different security patterns are successful, combined with a series of decision matrices to assist you in applying your own criteria for using Web service security patterns in your environment.