Using Trust to Resist Censorship in the Presence of Collusion

  • Andriy Panchenko
  • Lexi Pimenidis
Part of the IFIP International Federation for Information Processing book series (IFIPAICT, volume 232)


Censorship resistance deals with an attempt to prevent censors from the acquaintance of distribution of a particular content through the network. Providing resistance against censoring is a very challenging and difficult task to achieve. However it is vital for the purpose of freedom of speech, mind and achievement of democratic principles in todays society.

In this paper we define a model of a censorship resistant system. Thereafter we propose to split the problem of resisting censorship into the following two sub-problems: a trusted directory and steganographic data transfer. The directory is used in order to prolong contacts among peers based on their reputation in a way, that honest members get contacts only to other honest peers and colluded members remain isolated. Furthermore, we aim to provide an analysis of a trusted directory for reputation and its implications on censorship resistant systems. To this end we define a set of properties that such a directory has to fulfill and develop a proposal for the implementation. Finally we provide a simulation-based validation of our approach.


Communication Partner Cluster User Private Information Retrieval Trust Vector Honest User 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Ian Clarke, Oskar Sandberg, Brandon Wiley, and Theodore W. Hong. Freenet: A distributed anonymous information storage and retrieval system. In Proceedings of Designing Privacy Enhancing Technologies: Workshop on Design Issues in Anonymity and Unobservability, pages 46–66, July 2000.Google Scholar
  2. 2.
    George Danezis and Ross Anderson. The economics of censorship resistance. In Proceedings of Workshop on Economics and Information Security (WEIS04), May 2004.Google Scholar
  3. 3.
    Roger Dingledine, Michael J. Freedman, and David Molnar. The free haven project: Distributed anonymous storage service. In H. Federrath, editor, Proceedings of Designing Privacy Enhancing Technologies: Workshop on Design Issues in Anonymity and Unobservability. Springer-Verlag, LNCS 2009, July 2000.Google Scholar
  4. 4.
    European Union Internet Action Plan: Filtering & Rating., 2006. visited March 2006.
  5. 5.
    Nick Feamster, Magdalena Balazinska, Greg Harfst, Hari Balakrishnan, and David Karger. Infranet: Circumventing web censorship and surveillance. In Proceedings of the 11th USENIX Security Symposium, August 2002.Google Scholar
  6. 6.
    Stefan Köpsell and Ulf Hillig. How to achieve blocking resistance for existing systems enabling anonymous web surfing. In Proceedings of the Workshop on Privacy in the Electronic Society (WPES 2004), Washington, DC, USA, October 2004.Google Scholar
  7. 7.
    Ginger Perng, Michael K. Reiter, and Chenxi Wang. Censorship resistance revisited. In Proceedings of Information Hiding Workshop (IH 2005), June 2005.Google Scholar
  8. 8.
    Pycluster — Clustering Library., 2005. visited March 2006.
  9. 9.
    Universal Declaration of Human Rights., 1998. visited March 2006.
  10. 10.
    Documentation of Internet Filtering Worldwide., 2003. visited March 2006.
  11. 11.
    L. von Ahn, M. Blum, N. Hopper, and J. Langford. Captcha: Using hard ai problems for security. In Proceedings of Eurocrypt, pages 294–311, 2003.Google Scholar
  12. 12.
    Marc Waldman and David Mazières. Tangler: a censorship-resistant publishing system based on document entanglements. In Proceedings of the 8th ACM Conference on Computer and Communications Security (CCS 2001), pages 126–135, November 2001.Google Scholar
  13. 13.
    Marc Waldman, Aviel Rubin, and Lorrie Cranor. Publius: A robust, tamperevident, censorship-resistant and source-anonymous web publishing system. In Proceedings of the 9th USENIX Security Symposium, pages 59–72, August 2000.Google Scholar

Copyright information

© International Federation for Information Processing 2007

Authors and Affiliations

  • Andriy Panchenko
    • 1
  • Lexi Pimenidis
    • 1
  1. 1.Computer Science Department — Informatik IVRWTH Aachen UniversityAachenGermany

Personalised recommendations