Critical Information Infrastructures Security

This volume contains the proceedings of the 4th International Workshop on Critical Information Infrastructures Security (CRITIS 2009). The workshopwas held from September 30 to October 2 in the Gunnewig ¿ Hotel Bristol in Bonn, Germany. TheworkshopwasorganizedbytheFraunhoferInstituteforIntelligent Analysis and Information Systems (IAIS), Sankt Augustin, Germany. CRITIS 2009 continued the series of successful CRITIS Workshops. Com- nies,researchinstitutions,andgovernmentalorganizationsfromallmainareasof critical infrastructures took an active part in supporting CRITIS and we found CRITIS 2009 both exciting and informative. The selected papers addressed a range of key issues and demonstrated the ubiquity and global importance of - formation infrastructures. Each paper had at least three independent technical reviews and we accepted 13 full papers out of 34 submissions. We were very fortunate in having a range of invited speakers that c- ered policy, research and industry perspectives. James Smith from Los Alamos National Laboratory addressed the challenges and achievements in their work on Large-Scale Modeling and Simulation of Critical Infrastructure. Orestis Terzidis, Vice President SAP AG, talked on the The Internet for Energy: P- spectives and Challenges. Continuing with the energy theme, Alla Heidenreich, from SIEMENS AG, Corporate Research and Technologies (Germany) provided her insights on the Secure ICT Infrastructure for the Future Power Grid. Critical infrastructure protection is an area where an e?ective private-public partnership is required. A government perspective was provided by Michael P- germann, German Ministry of the Interior, who talked on German strategy - garding CIIP.