The 2004 Information Security Conference was the seventh in a series that started with the Information Security Workshop in 1997. A distinct feature of this series is the wide coverage of topics with the aim of encouraging interaction between researchers in di?erent aspects of information security. This trend c- tinuedintheprogramofthisyear¿sconference. Theprogramcommitteereceived 106 submissions, from which 36 were selected for presentation. Each submission was reviewed by at least three experts in the relevant research area. We would liketothankalltheauthorsfortakingtheirtimetopreparethesubmissions,and wehopethatthosewhosepapersweredeclinedwillbeableto?ndanalternative forum for their work. We were fortunate to have an energetic team of experts who took on the task of the program committee. Their names may be found