|Speaker:||Dr. Joao Barros, Universidade do Porto, Portugal|
Recent theoretical and practical work has shown that novel physical layer security techniques have the potential to significantly strengthen the security of wireless networks. In the first part of this talk we will briefly review the fundamentals in information-theoretic security and discuss our most recent results. Formulating the problem as one in which two legitimate partners communicate over a quasistatic fading channel and an eavesdropper observes their transmissions through another independent quasi-static fading channel, we define the secrecy capacity in terms of outage probability and provide a complete characterization of the maximum transmission rate at which the eavesdropper is unable to decode any information. In sharp contrast with known results for Gaussian wiretap channels (without feedback), our results show that in the presence of fading information-theoretic security is achievable even when the eavesdropper has a better average signal-to-noise ratio (SNR) than the legitimate receiver. The role of channel state information shall be discussed in detail.
Joao Barros received his undergraduate education in Electrical and Computer Engineering from the Universidade do Porto (UP), Portugal and Universitaet Karlsruhe, Germany, until 1999, and the Ph.D. degree in Electrical Engineering and Information Technology from the Technische Universitaet Muenchen (TUM), Germany, in 2004. After his doctoral research on network information theory and joint source and channel coding, Joao Barros joined the faculty of the Department of Computer Science at the Universidade do Porto, where he currently leads the Networking and Information Processing Group of the Instituto de Telecomunicacoes (a National Laboratory in Communications Engineering with more that 150 researchers with a PhD). The focus of his research lies in the general areas of information theory, communication networks and data security. In 2003, Dr. Barros received a Best Teaching Award from the Bavarian State Ministry of Sciences, Research and the Arts. In 2002 and 2003, he spent six months as a Fulbright scholar at Cornell University, where he worked on fundamental limits of wireless sensor networks. João Barros serves on the Technical Program Committees of ISIT 2007 and SSI 2006. In July 2006, he was appointed Secretary of the Board of Governors of the IEEE Information Theory Society.
|Presented On:||March 9th, 2007|
|Video:||QuickTime streaming video|