Proximax: Measurement-Driven Proxy Dissemination (Short Paper)

  • Damon McCoy
  • Jose Andre Morales
  • Kirill Levchenko
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7035)


Many people currently use proxies to circumvent government censorship that blocks access to content on the Internet. Unfortunately, the dissemination channels used to distribute proxy server locations are increasingly being monitored to discover and quickly block these proxies. This has given rise to a large number of ad hoc dissemination channels that leverage trust networks to reach legitimate users and at the same time prevent proxy server addresses from falling into the hands of censors. To address this problem in a more principled manner, we present Proximax, a robust system that continuously distributes pools of proxies to a large number of channels. The key research challenge in Proximax is to distribute the proxies among the different channels in a way that maximizes the usage of these proxies while minimizing the risk of having them blocked. This is challenging because of two conflicting goals: widely disseminating the location of the proxies to fully utilize their capacity and preventing (or at least delaying) their discovery by censors.


  1. 1.
    Wilson, D.: Burmese internet taken down with ddos attack (2010),
  2. 2.
    Moe, W.: No change as junta clamps down on suu kyi news (2010),
  3. 3.
    Mackinnon, R.: No quick fixes for internet freedom (2010),
  4. 4.
    Huffington, A.: Facebook, twitter and the search for peace in the middle east (2010),
  5. 5.
    Freegate - dynamic internet technology,
  6. 6.
  7. 7.
  8. 8.
    MacKinnon, R.: China’s censorship arms race escalates (2009),
  9. 9.
    Lewman, A.: Bridges and china, new thread (2010),
  10. 10.
    Dingledine, R., Mathewson, N., Syverson, P.: Tor: The second-generation onion router. In: Proceedings of the 13th USENIX Security Symposium (August 2004)Google Scholar
  11. 11.
    Dingledine, R., Mathewson, N.: Design of a blocking-resistant anonymity system (2007),
  12. 12.
    Proxy china - free anonymous surfing,
  13. 13.
  14. 14.
    Sovran, Y., Libonati, A., Li, J.: Pass it on: Social networks stymie censors. In: 7th International Workshop on Peer-to-Peer Systems, IPTPS (2008)Google Scholar
  15. 15.
    Mahdian, M.: Fighting Censorship with Algorithms. In: Boldi, P. (ed.) FUN 2010. LNCS, vol. 6099, pp. 296–306. Springer, Heidelberg (2010)CrossRefGoogle Scholar
  16. 16.
    Burnett, S., Feamster, N., Vempala, S.: Chipping away at censorship firewalls with user-generated content. In: Usenix Security (August 2010)Google Scholar
  17. 17.
    Riden, J.: How fast-flux service networks work,

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Damon McCoy
    • 1
  • Jose Andre Morales
    • 2
  • Kirill Levchenko
    • 1
  1. 1.University of California at San DiegoUS
  2. 2.Institute for Cyber SecurityUniversity of Texas at San AntonioUS

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