This book addresses Security in SOA with examples that illustrate detailed theory, industry standards and best practices. Therefore, we need to understand which security models and techniques appropriate for SOA. While it is true that security requires expert attention, everybody, including software developers, designers, architects, IT administrators and managers need to perform tasks that require a very good understanding of security topics. Fortunately, traditional security techniques have been there long enough for people to understand and apply in practice. Anyone who wants to implement SOA Security is now forced to dig through a maze of inter-dependent specifications and API documentation that assumes much prior experience in the reader. This gives the bottom-up understanding of security techniques appropriate for use in SOA without assuming any previous familiarity with the topic of security on the part of readers. Unlike most other books about SOA that only describes the standard, this book helps you get started immediately by walking you through sample code that illustrates how real life problems can be solved by using the techniques and best practices outlined in the standard. That the standards discuss all possible variations of each security technique, this book focuses on 20% of the variation that is used 80% of the time.