New technology is always evolving and companies must have appropriate security for their business to be able to keep up-to-date with the changes. With the rapid growth in internet and www facilities, database security will always be a key topic in business and in the public sector and has implications for the whole of society. Database Security Volume XII covers issues related to security and privacy of information in a wide range of applications, including: Electronic Commerce Informational Assurances Workflow Privacy Policy Modeling Mediation Information Warfare Defense Multilevel Security Role-based Access Controls Mobile Databases Inference Data Warehouses and Data Mining. This book contains papers and panel discussions from the Twelfth Annual Working Conference on Database Security, organized by the International Federation for Information Processing (IFIP) and held July 15-17, 1998 in Chalkidiki, Greece. Database Security Volume XII will prove invaluable reading for faculty and advanced students as well as for industrial researchers and practitioners working in the area of database security research and development.