§15§This book presents the most interesting talks given at ISSE 2008 - the forum for the interdisciplinary discussion of how to adequately secure electronic business processes. The topics include:- Identity Management, Information Security Management- PKI-Solutions, Economics of IT-Security- Smart Tokens, e-ID-Cards, Infrastructur Solutions- Critical Information Infrastructure Protection, Data Protection, Legal AspectsAdequate 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 2008. §04§From the contents:§Legal, Technical and Social Aspects of Security - Identityand Security Management - PKI based and Web 2.0 Security Services - Fraud Detection, Evaluation and Prevention - Large Scale Public Applications §01§Norbert Pohlmann ist Informatikprofessor für Verteilte Systeme und Informationssicherheit an der Fachhochschule Gelsenkirchen sowie geschäftsführender Direktor des Instituts für Internet-Sicherheit (www.internet-sicherheit.de). Er pflegt intensive Kontakte mit der Sicherheitsagentur der EU und ist Mitglied des wissenschaftlichen Beirates der Gesellschaft für Datenschutz und Datensicherung. §02§Prof. Helmut Reimer is Chief Executive Officer of TeleTrusT, Germany.