Topic: “GENERATING KEYS FROM WIRELESS FADING CHANNELS”
In this talk, we will discuss how to generate information theoretically secure keys using wireless fading channels. First, a key agreement framework that unifies existing source and channel models for key agreement over wireless fading channels is presented. It is shown that, in general, to fully exploit the resources provided by time varying channel gains, one needs to combine both the channel model and the source model. Asymptotic analyses suggest that in the long coherence time regime, the channel model is asymptotically optimal. On the other hand, in the high signal to noise ratio regime, the source model is asymptotically optimal. Second, the framework is extended to the scenario with an active attacker whose goal is to minimize the key rate that can be generated using our protocol. The attacker’s optimal attack strategy is identified. The key rate under this attack model is then characterized. Finally, we discuss how to extend this framework to a network setup. We will highlight interesting connections between the key generation problem and various network optimization problems.
Dr. Lifeng Lai received the B.E. and M. E. degrees in Information Science and Electrical Engineering from Zhejiang University, Hangzhou, China in 2001 and 2004 respectively, and the PhD degree in Electrical and Computer Engineering from the Ohio State University at Columbus, OH, in 2007. He was a postdoctoral research associate at the Department of Electrical Engineering, Princeton University from Sept. 2007 to Aug. 2009 and an assistant professor at University of Arkansas, Little Rock from Aug. 2009 to July 2012. He joined the Department of Electrical and Computer Engineering at Worcester Polytechnic Institute as an assistant professor in Aug. 2012.
Dr. Lai received the Best Paper Award from IEEE Global Communications Conference (Globecom) in 2008, the Best Paper Award from IEEE International Conference on Communications (ICC) in 2011, the Faculty Early Career Development (CAREER) Award from the National Science Foundation in 2011, and Northrop Young Researcher Award from University of Arkansas, Little Rock in 2012.
The Seminar is open to the public free of charge.