2007 Circumvention Landscape Report: Methods, Uses, and Tools

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2007 Circumvention Landscape Report: Methods, Uses, and Tools

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dc.contributor.author Palfrey, John
dc.contributor.author Roberts, Harold
dc.contributor.author Zuckerman, Ethan
dc.date.accessioned 2009-04-13T18:29:22Z
dc.date.issued 2009
dc.identifier.citation Hal Roberts et al., 2007 Circumvention Landscape Report: Methods, Uses, and Tools (2009). en
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:2794933
dc.description.abstract As the Internet has exploded over the past fifteen years, recently reaching over a billion users, dozens of national governments from China to Saudi Arabia have tried to control the network by filtering out content objectionable to the countries for any of a number of reasons. A large variety of different projects have developed tools that can be used to circumvent this filtering, allowing people in filtered countries access to otherwise filtered content. In this report, we describe the mechanisms of filtering and circumvention and evaluate ten projects that develop tools that can be used to circumvent filtering: Anonymizer, Ultrareach, DynaWeb Freegate, Circumventor/CGIProxy, Psiphon, Tor, JAP, Coral, and Hamachi. We evaluated these tools in 2007 -- using both tests from within filtered countries and tests within a lab environment -- for their utility, usability, security, promotion, sustainability, and openness. We find that all of the tools use the same basic mechanisms of proxying and encryption but that they differ in their models of hosting proxies. Some tools use proxies that are centrally hosted, others use proxies that are peer hosted, and others use re-routing methods that use a combination of the two. We find that, in general, the tools work in the sense that they allow users to access pages that are otherwise blocked by filtering countries but that performance of the tools is generally poor and that many tools have significant, unreported security vulnerabilities. The report was completed in 2007 and released to a group of private sponsors. Many of the findings of the report are now out of date, but we present them now, as is, because we think that the broad conclusions of the report about these tools remain valid and because we hope that other researchers will benefit from access to the methods used to test the tools. Responses from developers of the tools in question are included in the report. en
dc.publisher Berkman Center for Internet and Society en
dc.relation.isversionof http://cyber.law.harvard.edu/publications/2009/2007_Circumvention_Landscape_Report en
dash.license LAA
dc.title 2007 Circumvention Landscape Report: Methods, Uses, and Tools en
dash.depositing.author Palfrey, John

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