This book presents the most interesting talks given at ISSE 2015 - the forum for the interdisciplinary discussion of the key European Commission security objectives and policy directions. The topics include:

· Encrypted Communication

· Trust Services, eID and Cloud Security

· Industrial Security and Internet of Things

· Cybersecurity, Cybercrime, Critical Infrastructures

· BYOD and Mobile Security

· Regulation and Policies

· Biometric Applications

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 2015.