Principal Component-based Anomaly Detection Scheme* Mei-Ling Shyu Department of Electrical and Computer Engineering University of Miami Coral Gables, FL, USA shyu@miami.edu Shu-Ching Chen School of Computer Science Florida International University Miami, FL, USA chens@cs.fiu.edu Kanoksri Sarinnapakorn Department of Electrical and Computer Engineering University of Miami Coral Gables, FL, USA ksarin@miami.edu LiWu Chang Center for High Assurance Computer Systems Naval Research Laboratory Washington, DC, USA lchang@itd.nrl.navy.mil * The preliminary version of the current draft was published in [23].