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Student Activity
Events for November
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USC CS Colloquium Series
Thu, Nov 02, 2006 @ 03:30 PM - 05:00 PM
Thomas Lord Department of Computer Science
Student Activity
Prof. Ahmed ElgammalRutgers UniversityTitle and Abstract to comeBioDr. Ahmed Elgammal is an assistant professor at the Department of Computer Science, Rutgers, the State University of New Jersey Since Fall 2002. Dr. Elgammal is also a member of the Center for Computational Biomedicine Imaging and Modeling (CBIM) and the Center for Advanced Information Processing (CAIP) at Rutgers. His primary research interest is computer vision and machine learning. His research focus includes human activity recognition, human motion analysis, tracking, human identification, and statistical methods for computer vision. He develops robust real-time algorithms to solve computer vision problems in areas such as visual surveillance, visual human-computer interaction,virtual reality, and multimedia applications. Dr. Elgammal interest includes also research on document image analysis. Dr. Elgammal received the National Science Foundation CAREER Award in 2006.Dr. Elgammal received his B.Sc. and M.Sc. degrees in computer science and automatic control from University of Alexandria, Egypt in 1993 and 1996, respectively. He received another M.Sc. and his Ph.D. degree in computer science from the University of Maryland, College Park, in 2000 and 2002 respectively.Hosted by: Prof. Gerard Medioni
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Nancy Levien
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USC CS Colloquium Series
Thu, Nov 09, 2006 @ 03:30 PM - 05:00 PM
Thomas Lord Department of Computer Science
Student Activity
Dr. Brad KarpUniversity College LondonTitle: Evolution in Action: Worms and Worm DefensesAbstract:Secure systems are interesting to design and build because they face an adaptive, adversarially constructed workload. In this talk, I will trace three years of experience building systems to defend Internet-connected hosts from Internet worms, and the evolutionary pressure exerted on worm designers by defenses.I will first describe Autograph, a system that generates signatures for never-before-seen worms quickly and automatically. A distributed deployment of Autograph would have generated a signature for Code-Red-Iv2 before 2% of vulnerable Internet hosts had become infected (despite the exponential spread of worms, which can scan the entire Internet address space in minutes).The natural response of worm authors to signature-based worm quarantine is to render worms *polymorphic*, so that they change their payloads on every infection attempt, and thus match no single contiguous signature. Motivated by this threat model, I will describe Polygraph, a suite of signature generation algorithms that can be used to automatically generate signatures, even for polymorphic worms.I will finally describe Paragraph, a suite of attacks on signature generation algorithms based on conventional machine learning (sadly, including Polygraph). The attacks in Paragraph are particularly devastating because they are practical attacks on learning *itself*. As conventional learning approaches assume that training examples are random in content, or even designed by a *helpful* teacher, they perform unacceptably when a malicious adversary controls training examples.I will close with a few final musings on how to design signature generation systems immune to Paragraph-style attacks.[This talk will describe joint work with Andrea Bittau, Mark Handley, Hyang-Ah Kim, Jinyang Li, Jim Newsome, and Dawn Song.] Biography: "Brad Karp is an Associate Professor (or "Senior Lecturer," in UK academic parlance) at the Department of Computer Science at University College London. He previously was a Staff Scientist at ICIR (originally ACIRI) at ICSI in Berkeley, a Senior Staff Researcher at Intel Research Pittsburgh, and Adjunct Assistant Professor at Carnegie Mellon University's Computer Science Department. His research marries the design of algorithms and the building of real systems, in the areas of wireless and sensor networks (e.g., GPSR and CLDP for geographic routing), Internet worm quarantine (e.g., Autograph and Polygraph for worm signature generation), and Internet-scale distributed systems (e.g., Open DHT, a public DHT service, and Re:, a system to eliminate false positives caused by spam filtering). Brad holds a Royal Society-Wolfson Reseach Merit Award, given to recruit leading scientists to UK universities."Hosted by: Prof. Ramesh Govindan
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Nancy Levien
