This work is supported by the National Science Foundation under grants ANI-0230960 and CNS-0627752 and by generous donations from Intel Corporation.
Research Goals:
This project examines a number of approaches for deploying proof-of-work or client puzzles within the network.
Wu-chang Feng
Ed Kaiser
Wu-chi Feng
Antoine Luu
  • Tien Le, Akshay Dua, Wu-chang Feng, "kaPoW Plugins: Protecting Web Applications Using Reputation-based Proof-of-Work", in Proceedings of WebQuality 2012, April 2012. paper
  • Wu-chang Feng, Ed Kaiser, "kaPoW Webmail: Effective Disincentives Against Spam", in Proceedings of CEAS 2010, July 2010. pdf Slides: pdf
  • Ed Kaiser, Wu-chang Feng, "Helping TicketMaster: Changing the Economics of Ticket Robots with Geographic Proof-of-Work", in Proceedings of Global Internet 2010, March 2010. Paper: pdf
  • Wu-chang Feng, Travis Schluessler, "The Case for Network Witnesses", in Proceedings of Workshop on Secure Network Protocols (NPSec) 2008, October 2008. Paper: pdf, Slides: ppt | pdf
  • Ed Kaiser, Wu-chang Feng, "mod_kaPoW: Protecting the Web with Transparent Proof-of-Work", in Proceedings of Global Internet 2008, April 2008. Paper: pdf Slides (Intel talk 3/2008): pdf.
  • Wu-chang Feng, Ed Kaiser, "The Case for Public Work", in Proceedings of Global Internet 2007, May 2007. Paper: pdf Slides: ppt | pdf
  • Wu-chang Feng, Ed Kaiser, Wu-chi Feng, Antoine Luu, "The Design and Implementation of Network Puzzles", in Proceedings of INFOCOM 2005, March 2005. Paper: pdf Slides: ppt | sxi.
  • Wu-chang Feng, "The Case for TCP/IP Puzzles", in Proceedings of ACM SIGCOMM Future Directions in Network Architecture (FDNA-03), August 2003. Paper: pdf, Slides: sxi | pdf
  • Invited Talks:
  • Wu-chang Feng, "mod_kaPoW: Protecting the Web with Transparent Proof-of-Work", Intel colloquium talk, Hillsboro, OR, March 2008. Slides: pdf
  • Wu-chang Feng, "Using an Angel-in-the-Box to Secure MANETs", DARPA IAMANET proposer's day conference, April 2007. Slides: ppt
  • Wu-chang Feng, "The Design and Implementation of IP Puzzles", Cisco security shop talk, April 2004.
  • Wu-chang Feng, "IP Puzzles, Probabilistic Networking, and Other Projects at OGI@OHSU", Intel colloquium talk, Hillsboro, OR, October 2003. Abstract: txt
  • Wu-chang Feng, "Hashes, Caches, Puzzles, and the IXP", Intel IXA Workshop, Santa Clara, CA, September 2003. Slides: sxi | pdf
  • Posters and Demos:
  • Ed Kaiser, Wu-chang Feng, "mod_kaPoW: Putting the 'PoW' into Proof-of-Work", SIGCOMM 2008 demo session, August 2008. Poster: PDF
  • Ed Kaiser, Wu-chang Feng, "mod_kaPoW: Mitigating Denial-of-Service with Transparent Proof-of-Work", CoNext 2007 poster session, December 2007. ppt. Also in NSF CyberTrust PI Meeting 2008 poster session, March 2008. ppt
  • Ed Kaiser, Wu-chang Feng, Wu-chi Feng, Antoine Luu, "Reducing Malicious Traffic With IP Puzzles", ACM SIGCOMM 2004 poster session, September 2004. Abstract: pdf, Poster: pdf
  • Software:
    DShield report:
    Last modified: August 7, 2004.