Dr. Christos Xenakis received his B.Sc degree in computer science in 1993 and his M.Sc degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998 – 2001 he was with a Greek telecoms system development firm, where he was involved in the design and development of advanced telecommunications subsystems. From 1996 – 2007 he was a member of the Communication Networks Laboratory of the University of Athens. Since 2007 he is a faculty member of the Department of Digital Systems of the University of Piraeus, Greece, where currently is an Assistant Professor and member of the System Security Laboratory. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST, AAL) as well as National Programs (Greek) and his research interests are in the field of systems, networks and applications security.