Steffen Wendzel is a 3rd year PhD student at the University of Hagen and a researcher at the Augsburg University of Applied Sciences. He is author of various scientific/professional papers and four IT-related books. His latest book “Tunnel und verdeckte Kanäle im Netz” (Springer-Vieweg) deals with network covert channels. His research interests comprise network covert channels, network protocol engineering and TCP/IP protocols, network security, administration and programming of Linux/Unix/BSD systems, and building automation security.