Communications and Multimedia Security is an essential reference for both academic and professional researchers in the fields of Communications and Multimedia Security. This state-of-the-art volume presents the proceedings of the Eighth Annual IFIP TC-6 TC-11 Conference on Communications and Multimedia Security, September 2004, in Windermere, UK. The papers presented here represent the very latest developments in security research from leading people in the field. The papers explore a wide variety of subjects including privacy protection and trust negotiation, mobile security, applied cryptography, and security of communication prools. Of special interest are several papers which addressed security in the Microsoft .Net architecture, and the threats that builders of web service applications need to be aware of. The papers were a result of research sponsored by Microsoft at five European University research centers. This collection will be important not only for multimedia security experts and researchers, but also for all teachers and administrators interested in communications security.