title: Improving Security for SCADA Sensor Networks with Reputation Systems and Self-Organizing Maps.
abstract: The reliable operation of modern infrastructures depends on computerized systems and Supervisory Control and Data Acquisition (SCADA) systems, which are also based on the data obtained from sensor networks. The inherent limitations of the sensor devices make them extremely vulnerable to cyberwarfare/cyberterrorism attacks. In this paper, we propose a reputation system enhanced with distributed agents, based on unsupervised learning algorithms (self-organizing maps), in order to achieve fault tolerance and enhanced resistance to previously unknown attacks. This approach has been extensively simulated and compared with previous proposals.
authors.affiliation: Department Ingeniería Electrónica, ETSI Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense, 30, 28040 Madrid, Spain; E-Mails:  araujo@die.upm.es  (A.A.);  zorana@die.upm.es  (Z.B.);  goyeneche@die.upm.es  (J.M.G.);  jcvallejo@die.upm.es  (J.C.V.);  malagon@die.upm.es  (P.M.);  danielvg@die.upm.es  (D.V.);  dfraga@die.upm.es  (D.F.);  elena@die.upm.es  (E.R.);  jblesa@die.upm.es  (J.B.).
authors.forename: José M
authors.initials: JM
authors.lastname: Moya
authors.forename: Alvaro
authors.initials: A
authors.lastname: Araujo
authors.forename: Zorana
authors.initials: Z
authors.lastname: Banković
authors.forename: Juan-Mariano
authors.initials: JM
authors.lastname: de Goyeneche
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Vallejo
authors.forename: Pedro
authors.initials: P
authors.lastname: Malagón
authors.forename: Daniel
authors.initials: D
authors.lastname: Villanueva
authors.forename: David
authors.initials: D
authors.lastname: Fraga
authors.forename: Elena
authors.initials: E
authors.lastname: Romero
authors.forename: Javier
authors.initials: J
authors.lastname: Blesa