Theoretical and Practical Aspects of Secret-Key Agreement over Wireless Channels

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• Prof. Matthieu Bloch, Georgia Institute of Technology
• Thursday 21 June 2012, 14:00-15:00
• Gabor Seminar Room, 611.

If you have a question about this talk, please contact Cong Ling.

In this talk, we present recent results related to physical-layer security, a new paradigm for securing communications at the physical layer by exploiting the imperfections of communication media. Specifically, we focus on the distillation of information-theoretically secure keys from the observation of wireless channels, and we address experimental, information-theoretic, coding-theoretic facets of the problem.

We first motivate the problem with experimental measurements obtained on a software-defined radio testbed, which show that the reciprocity and spatial diversity of wireless channels provide a natural source of randomness that can be exploited for secret-key agreement. We then show that the coding mechanisms of secret-key agreement can be tied to the problems of source coding with side information and to the problem of extracting the intrinsic randomness of a channel. We use these concepts to discuss various aspects of secret-key agreement over wireless channels, such as the robustness of the results with respect to the knowledge of an eavesdropper’s statistics. Finally, we conclude with a discussion of practical code constructions for secret-key agreement.

Bio: Matthieu Bloch received the Engineering degree from Supélec, 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 Université de Franche-Comté, Besançon, 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, USA . Since July 2009, Dr. Bloch has been on the faculty of the School of Electrical and Computer Engineering at the Georgia Institute of Technology, where he is currently an Assistant Professor based at the Georgia Tech Lorraine campus. 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 is also the current chair of the Online Committee of the IEEE Information Theory Society. 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.

This talk is part of the COMMSP Seminar series.

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