This book constitutes the refereed proceedings of the 4th International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2006. The book presents 22 revised full papers presented together with 3 invited talks. Coverage includes work on foundations and semantics of timed systems including timed automata, timed Petri nets, timed MSCs, hybrid automata, timed process algebra, timed temporal logics, timed abstract state machines, as well as probabilistic models.

This book constitutes the refereed proceedings of the 11th European Symposium on Research in Computer Security, ESORICS 2006. The 32 revised full papers presented were carefully reviewed and selected from 160 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.