This book presents the most interesting talks given at ISSE 2010 - the forum for the inter-disciplinary discussion of how to adequately secure electronic business processes. The topics include: - Identity and Security Management - Technical and Economical Aspects of Cloud Security - Security Services and Large Scale Public Applications - Smart Grid Security and Emerging Security Solutions - Privacy and Data Protection Adequate information security is one of the basic requirements of all electronic business processes. It is crucial for effective solutions that the possibilities offered by security technology can be integrated with the commercial requirements of the applications. The reader may expect state-of-the-art: best papers of the Conference ISSE 2010. The content: Identity and Security Management - Technical and Economical Aspects of Cloud Security - Security Services and Large Scale Public Applications - Smart Grid Security and Emerging Security Solutions - Privacy and Data Protection - Security Threats and Contermeasures Target Groups: Developers of Electronic Business Processes IT Managers IT Security Experts Researchers About the Editors: Norbert Pohlmann: Professor for System and Information Security at the University of Applied Sciences in Gelsenkirchen Helmut Reimer: Senior Consultant, TeleTrusT Wolfgang Schneider: Deputy Institute Director, Fraunhofer Institute SIT.