As more companies are implementing XML based information exchange technologies - so-called web services, security has become a critical issue. This is especially true in the ares of e-commerce. Varions XML based standards have evolved to cater to the security needs of web services, such as XML Encryption (XML ENC), XML Digital Signatures (XML DSIG), and the XML Key Management Specification (XKMS). This book presents detailed information on these and other XML security standards. It goes a step further by demonstrating the practical use of XML security standards, using both the J2EE and the. NET platforms. Alter reading this book, developers will understand what secure web services are and how to implement them.