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This volume contains the proceedings of the fourth edition of the International Symposium on Trustworthy Global Computing (TGC 2008) that was held in Barcelona, Spain, November 3-4, 2008. The Symposium on Trustworthy Global Computing is an international annual venue dedicated to safe and reliable c- putation in global computers. It focuses on providing frameworks, tools, and protocolsfor constructing well-behavedapplications and onreasoningrigorously about their behavior and properties. The related models of computation inc- porate code and data mobility over distributed networks with highly dynamic topologies and heterogeneous devices. This volume contains one invited paper from Gianluigi Zavattaro and co- thors, as well as the revised versions of the 12 contributed papers; these versions take into account both the referees’ reports and the discussions that took place during the symposium. The Program Committee selected 12 papers from 26 submissions. Every submission was reviewed by at least three members of the Program Committee. In addition, the Program Committee sought the opinions of additional referees, selected because of their expertise in particular topics. We are grateful to Andrei Voronkov for his EasyChair system that helped us to manage these discussions. We would like to thank the authors who submitted paperstotheconference,the membersofthe ProgramCommittee,andthead- tional reviewersfor their excellent work. We would also like to thank the invited speakers to TGC 2008, Giuseppe Ateniese, Sophia Drossopoulou, and Gianluigi Zavattaro.
