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A thesis
Submitted to the Faculty
of
Purdue University
by
Wenliang Du
In Partial Ful llment of the
Requirements for the Degree
of
Doctor of Philosophy
August 2001

ACKNOWLEDGMENTS
Throughout my graduate experience, I have been very fortunate to cross paths
with great people, who have had a dramatic impact on my research and my accom-
plishments.
The person who contributed most to my thesis research was my major advisor
Professor Mikhail Atallah. I was very lucky to discuss an interesting problem with
him when I was still painfully looking for a thesis topic. It was that discussion that led
to the discovery of my thesis topic. Ever since, it has been a privilege and a pleasure
to work with him, to talk with him, and to learn from him. His amazing quickness
when coming up with ideas has always been inspiring, his insights and suggestions
have been invaluable for my work, and his willingness to discuss with me at anytime
has been very helpful. I am very grateful to him.
The person who always advised me, supported me and helped me during my
ve years' graduate research is my other advisor, Professor Eugene Spa ord, whose
research in the security area was the major reason that attracted me to Purdue
University. During these ve years, he has provided me with a lot of support and
the freedom I needed to be successful in my research; he has taught me a great deal
about how to do research, how to think of problems, and most of all, how to become
a respected scholar. I am greatly indebted to him.
iv
My graduate studies were conducted in the Center for Education and Research
in Information Assurance and Security (CERIAS), formerly known as the Computer
Operations, Audit and Security Technology (COAST) Laboratory. I bene ted a lot
from the research and education environment that CERIAS provided. I thank all
of my colleagues in CERIAS, especially Hoi Chang, Tom Daniels, Chapman Flack,
Benjamin Kuperman, Mahesh Tripunitara and Diego Zamboni for accompanying me
from COAST to CERIAS, and for invaluable discussions during the last ve years.
Several people deserve special mention: Professor Aditya Mathur for advising
me during the rst two years of my research in the security testing area; Professor
Jens Palsberg and Professor Sunil Prabhakar for serving on my thesis committee
and for reading my thesis; Dr. William J. Gorman in the graduate student oÆce for
helping me through a lot of oÆcial paper work; Marlene Walls for administrative
support; Vince Koser, Susana Soriano and Kent Wert for their excellent systems
administration support; Professor Clay Shields for giving me valuable job-hunting
advice; Jared Crane, Rajeev Gopalakrishna and Florian Kerschbaum for the research
discussions.
Most of all, I would like to thank my beloved wife, my parents and my brothers
for their unconditional love, encouragement and support.
Portions of this work were supported by Grant EIA-9903545 from the National
Science Foundation, and by the various sponsors of CERIAS; that support is gratefully
acknowledged.
v
TABLE OF CONTENTS
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