Toronto Networking Seminar

An Overlay Approach to Data Security in Ad-Hoc Networks

Jorg Liebeherr
University of Toronto

Date:  October 7,  3pm
Location: BA1210 (Bahen Center)


While it has been argued that application-layer overlay protocols can enhance delivery services in mobile ad-hoc networks, little is known about the actual throughput and delay performance achievable in such networks. This talk presents an evaluation of an application-layer solution to ad-hoc networking that ensures integrity and confidentiality of application data. Results from indoor and outdoor measurement experiments with mobile handheld devices provide insights into the performance and overhead of overlay protocols in ad-hoc networks. A new key management and encryption scheme, called neighborhood key method is presented, where each node shares secrets only with authenticated neighbors in the ad-hoc network, thus avoiding global re-keying operations. All presented solutions are realized in the HyperCast software system for application-layer overlay networking.             
The talk presents joint work with Guangyu Dong.


Jorg Liebeherr received the Ph.D. degree in Computer Science from the Georgia Institute of Technology in 1991. After a Postdoc at the University of California, Berkeley, he joined the Department of Computer Science at the University of Virginia in 1992. In 1997/1998 he was an Associate Professor in the Department of Electrical Engineering at Polytechnic University. Since Fall 2005, he is with the ECE Department of the University of Toronto as the Nortel Chair of Network Architecture and Services. He received an NSF Career award in 1996, a University of Virginia Teaching and Technology fellowship in 1995, a Virginia Engineering Foundation fellowship in 2002, and a best paper award at ACM Sigmetrics 2005.