"Security and Privacy in the Age of Uncertainty" is a specialized book that addresses the challenges of information security and data protection across a variety of applications. It covers topics such as secure networks and distributed systems, secure multicast communication, and mobile networks. Additionally, it discusses aspects of intrusion prevention and detection, access control policies and models, as well as security protocols. The book includes selected contributions from the 18th International Conference on Information Security (SEC2003) and the associated workshops, which took place in May 2003 in Athens. The conference and workshops were sponsored by the International Federation for Information Processing (IFIP) and provide valuable insights into current security issues and their solutions.