From: Adrian Perrig (adrian@ece.cmu.edu)
Date: 03/24/03
Bill Arbaugh is visiting on Monday March 31. He will give a talk at the C3S
seminar at noon in Hamerschlag 1112 (food provided). If you would like to meet
with Bill, please contact Linda Whipkey (ljwhipkey@ece.cmu.edu). Greetings,
Adrian
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Using Neighbor Graphs in support of fast and secure WLAN mobility
William A. Arbaugh
Department of Computer Science and UMIACS
University of Maryland, College Park
http://www.cs.umd.edu/~waa
IEEE 802.11 based wireless networks have seen rapid growth and
deployment in recent years. Critical to the 802.11 MAC operation is
the hand-off function that occurs when a mobile node moves its
association from one access point (or base station) to another. In
this talk I will present an empirical study of the 802.11 handoff
process at the link layer which will include a detailed breakup of the
contributing factors of the latency. In particular, I will show that a
MAC layer function, probe, is the primary contributor to the overall
handoff latency in current deployments, and that a proposed standard
inter-access point protocol (IAPP) contributes an additional
unwarranted delay. I will then describe a novel method for dynamically
learning the mobility topology of the network, i.e. the neighbor
graph. Neighbor graphs are then used to cache context ahead of a
mobile station ensuring that the station's context is always one hop
ahead. I will next provide implementation and performance
details. Specifically, we find that the use of neighbor graphs with
IAPP reduces the hand-off latency by an order of magnitude. Finally,
I will conclude the talk by describing how neighbor graphs can support
key distribution such that a mobile station need only establish a
security association once per session per administrative domain-
supporting fast and secure mobility.
NOTE: This is joint work with Arunesh Mishra and Min-ho Shin of the
University of Maryland, as well as Insun Lee and Kyunghun Jang of
Samsung Electronics.
------------------------------------------------------------------------
William Arbaugh joined the Computer Science department at Maryland
after spending sixteen years with the U.S. Department of Defense-
first as a commissioned officer in the Army and then as a
civilian. During the sixteen years, Prof. Arbaugh served in several
leadership positions in diverse areas ranging from tactical
communications to advanced research in information security and
networking. In his last position, Prof. Arbaugh served as a senior
technical advisor in an office of several hundred computer scientists,
engineers, and mathematicians conducting advanced networking research
and engineering. Prof. Arbaugh received a B.S. from the United States
Military Academy at West Point, a M.S. in computer science from
Columbia University in New York City, and a PhD in computer science
from the University of Pennsylvania in Philadelphia. Prof. Arbaugh's
research interests include information systems security and privacy
with a focus on wireless networking, embedded systems, and
configuration management. He also currently serves on the editorial
board of IEEE Computer where he edits a bi-monthly column on
Information Security.
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