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In recent years, Information-centric Networking (ICN) has received much attention from both academic and industry participants. ICN offers a data-centric means of inter-networking that is radically different from today's host-based IP networks. Security and privacy issues in ICN have become increasingly important as ICN technology gradually matures and nears real-world deployment. As is well known, in today's Internet, security and privacy features were originally not present and had to be incrementally and individually retrofitted (with varying success) over the last 35 years. In contrast, since ICN-based architectures (e.g., NDN, CCNx, etc.) are still evolving, it is both timely and important to explore ICN security and privacy issues as well as devise and assess possible mitigation techniques. This report documents the program and outcomes of the Dagstuhl Seminar 16251 "Information-centric Networking and Security." The goal was to bring together researchers to discuss and address security and privacy issues particular to ICN-based architectures. Attendees represented diverse areas of expertise, including: networking, security, privacy, software engineering, and formal methods. Through presentations and focused working groups, attendees identified and discussed issues relevant to security and privacy, and charted paths for their mitigation.