As XML is more broadly used in both web sites and business applications, the need to insure security of XML based applications grows. Most books on XML have at best a chapter devoted to security issues, and there is only one other book currently on the market devoted exclusively to XML Security. This book will show developers all they need to know about how to use XML Digital Signatures to protect the integrity and authenticity of data, and how to use XML Encryption to control its confidentiality. The lead author is at the center of the IETF and W3C working groups formalizing the standards, so there is no one better qualified to write about them. The book will also appeal to networking/security professionals who need to start dealing with the impact of XML on network security.