Title: Towards a unified information theoretic approach to physical-layer security
Speaker: Prof. Matthieu Bloch
Georgia Institute of Technology
As the result of sustained research efforts over the past decade, information-theoretic models and coding schemes for physical-layer security have evolved much beyond the original wiretap channel introduced by Wyner. Examples, of recent development include the introduction of stronger secrecy metrics, the analysis of more adversarial models, the construction of codes with performance getting closer to the fundamental limits, and the demonstration of several proof-of-principle experiments. In this talk, we will argue that these improvements have been made possible with the use of more sophisticated information-theoretic tools but have also led to a conceptually simpler approach to many physical-layer security problems. In particular, we will argue that most problems can be solved by appropriately combining four primitives: channel coding, channel output approximation, source coding with side information, and channel randomness extraction. After presenting these primitives and highlighting their usefulness, we will discuss how to exploit them in the context of covert communications.
Matthieu Bloch is an Associate Professor in the School of Electrical and Computer Engineering. He received the Engineering degree from Sup╚lec, Gif-sur-Yvette, France, the M.S. degree in Electrical Engineering from the Georgia Institute of Technology, Atlanta, in 2003, the Ph.D. degree in Engineering Science from the Universit╚ de Franche-Comt╚, Besan┴on, France, in 2006, and the Ph.D. degree in Electrical Engineering from the Georgia Institute of Technology in 2008. In 2008-2009, he was a postdoctoral research associate at the University of Notre Dame, South Bend, IN. Since July 2009, Dr. Bloch has been on the faculty of the School of Electrical and Computer Engineering, and from 2009 to 2013 Dr. Bloch was based at Georgia Tech Lorraine. His research interests are in the areas of information theory, error-control coding, wireless communications, and cryptography. Dr. Bloch is a member of the IEEE and has served on the organizing committee of several international conferences; he was the chair of the Online Committee of the IEEE Information Theory Society from 2011 to 2014 and has been on the Board of Governors since January 2015. He is the co-recipient of the IEEE Communications Society and IEEE Information Theory Society 2011 Joint Paper Award and the co-author of the textbook Physical-Layer Security: From Information Theory to Security Engineering published by Cambridge University Press.