This book constitutes the refereed proceedings of the 12th European Symposium on Research in Computer Security, ESORICS 2007, held in Dresden, Germany in September 2007.

The 39 revised full papers presented were carefully reviewed and selected from 164 submissions. ESORICS is confirmed as the European research event in computer security; it presents original research contributions, case studies and implementation experiences addressing any aspect of computer security - in theory, mechanisms, applications, or practical experience.