Davide Ariu has graduated in July 2006 discussing a thesis titled "Detection of Attacks in Computer Networks with Hidden Markov Models". In January 2007 he has become a Ph.D. student of the Ph.D. Program in Electronic and Computer Engineering at the Department of Electrical and Electronic Engineering (University of Cagliari). From March to August 2007 he has been a visiting student at GTISC (Georgia Tech Information Security Center) working with the group leaded by prof. Wenke Lee. His research interests are focussed on the application of Pattern Recognition methods to Information Security Problems. In particular, he works on the analysis of the HTTP Payloads aimed at the detection of attempts of intrusion and on the security of Web Servers/Applications.