IP Puzzles, probabilistic networking and other projects at OGI@OHSU
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  Over the years, distributed denial-of-service (DDoS) attacks via
  worms and viruses have periodically disrupted the Internet.  Client
  puzzles have been proposed as one mechanism for protecting protocols
  against such attacks.  In the first part of this talk, we first make
  the case that puzzles must be placed within the IP layer in order to
  be effective.  We then describe some of the scenarios IP puzzles
  enable and some of the open research issues that must be resolved
  in order to build effective, puzzle-protected network systems. 
  Finally, we describe the design, implementation, and evaluation
  of an initial prototype and ruminate on the golden opportunity
  IP puzzles might provide Intel.
 
  Based on the level of interest, I will also describe our work at OGI
  related to:
 
  o Approximate and exact caches for packet classification
  o Network and OS support for massively multiplayer on-line game
    servers
  o TCPivo: A high-performance packet replay engine
  o Panoptes: A flexible video sensor platform