A particularly nefarious form of attack on Digital Fingerprinting systems is posed by coalitions of legal users who combine their contents to undermine the fingerprints. In fact, the main challenge in Digital Fingerprinting is the design of collusion resistant fingerprints. My research has addressed fundamental issues of design and analysis of collusion resistant fingerprints. In this talk, I will introduce a novel mathematical framework for analyzing the performance of collusion attacks. The collusion attack is viewed as the cascade of an estimator of digital content and a source of randomness. Statistical signal processing and information-theoretic methods are used to analyze these attacks. Later in the talk, I will identify the optimal fingerprint constellations against the worst attacks where the optimality is in terms of a geometrical figure of merit (minimum distance property of the constellation) as well as a detection theoretic figure of merit (probability of error of the detector). Finally, I will address the fundamental tradeoffs between the total number of the users, the maximum size of the coalition, and the length of the host signal for the reliable detection of the fingerprints.
Time and Place: Fri., Mar. 30, at 2:30 pm in 3609 Engr. Hall. *** NOTE SPECIAL DAY, TIME, & ROOM ***
SYSTEMS SEMINAR WEB PAGE: http://homepages.cae.wisc.edu/~gubner/seminar/schedule.html