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.