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Towards a Censorship Analyser for Tor
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science. (PriSec)
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Analysing censorship incidents targeting popular circumvention tools such as Tor can be a tedious task. Access to censoring networks is typically difficult to obtainand remote analysis is not always possible. Analysis is however feasible if users behind the censoring networks are given the opportunity to help. In this paper, we propose a lightweight censorship analyser for Tor which is meant to be run by volunteering users. The analyser automatically gathers relevant data and the final report is sent back to the Tor developers. Our design builds on existing software and should be easy to bundle and deploy.

Place, publisher, year, edition, pages
USENIX - The Advanced Computing Systems Association, 2013.
Keyword [en]
censorship, network measurement, tor, censorship analysis
National Category
Computer Systems
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-29025OAI: oai:DiVA.org:kau-29025DiVA: diva2:647978
Conference
3rd USENIX Workshop on Free and Open Communications on the Internet
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2015-12-29Bibliographically approved
In thesis
1. Enhancing Censorship Resistance in the Tor Anonymity Network
Open this publication in new window or tab >>Enhancing Censorship Resistance in the Tor Anonymity Network
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Baksidestext

The Tor network was originally designed as low-latency anonymity network.However, as the years progressed, Tor earned a reputation as also being a useful tool to circumvent Internet censorship. At times, the network counted 30,000 users only from China. Censors reacted by tightening their grip on the national communication infrastructure. In particular, they developed techniques to prevent people from being able to access the Tor network. This arms race now counts several iterations and no end is in sight.

This thesis contributes to a censorship-resistant Tor network in two ways. First, it analyses how existing censorship systems work. In particular, the Great Firewall of China is analysed in order to obtain an understanding of its capabilities as well as to explore circumvention opportunities. Second, this thesis proposes practical countermeasures to circumvent Internet censorship. In particular, it presents a novel network protocol which is resistant to the Great Firewall's active probing attacks.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2014
Series
Karlstad University Studies, ISSN 1403-8099 ; 2014:5
Keyword
tor, censorship, anonymity, network
National Category
Computer Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-30752 (URN)978-91-7063-534-2 (ISBN)
Presentation
2014-02-27, 10:00 (English)
Opponent
Supervisors
Available from: 2014-01-22 Created: 2013-12-18 Last updated: 2014-01-22Bibliographically approved

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foci2013.pdf(185 kB)328 downloads
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CiteExportLink to record
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Citation style
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