Software-defined networks have quickly become one of the most overhyped networking concepts, with vendors promising earth-shattering results … and handwaving over scalability, reliability and security issues. The presentation will briefly introduce the concepts of SDN and OpenFlow (the tool used to build controller-based networks that require low-level network device control), the security aspects of programmable- and controller-based networks and the potential SDN- and OpenFlow-based security use cases, from scale-out IDS clusters to first-hop network security and user authentication/authorization solutions.