Participation in the workshop is open to anyone who registers (no submission necessary). Participation in the working group on July 9 is limited because of the emphasis on achieving a high degree of interactivity and discussion. Workshop participants who are interested in participating in the working group session should send a 1-page abstract or position paper describing their work relevant to this workshop to firstname.lastname@example.org. Abstracts and position papers should be submitted in plain text, HTML, or PDF formats only. All submissions must be received by April 2, 2004 and authors will be notified by April 19, 2004 as to whether they have been accepted to participate in the working group. In addition, the authors of some submissions will be invited to present 10-minute short talks about their work. Submissions may describe ongoing or planned work related to the development of usable interfaces for security or privacy software, or they may discuss important research problems or propose a research agenda in this area. Submissions are especially encouraged that identify security and privacy areas in need of examination by HCI researchers, as well as areas where HCI researchers would like assistance from security and privacy researchers.