Abstract

I am indebted to my advisor, Dr. Mark Stamp, for his consistent guidance, support, and encouragement throughout my master program. Dr. Mark Stamp has tirelessly guided me on how to perform meaningful research at every step. He has been and will always be an excellent role model for me. I would like to specially thank Dr. Robert Chun and Dr. Teng Moh for serving on my defense committee. I also would like to thank my friends, Fan Yang, Leyan Tang, and Yue Chen. They have made my life in San Jose enjoyable and memorable. I am especially grateful to In modern computer systems, usernames and passwords have been by far the most common forms of authentication. A security system relying only on password protection is defenseless when the passwords of legitimate users are compromised. A masquerader can impersonate a legitimate user by using a compromised password. An intrusion detection system (IDS) can provide an additional level of protection for a security system by inspecting user behavior. In terms of detection techniques, there

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