The Berkman Center for Internet & Society is pleased to make available its report on techniques and tools for circumventing Internet filtering:
2007 Circumvention Landscape Report: Methods, Uses, and Tools (PDF)
by Hal Roberts, Ethan Zuckerman, and John Palfrey
As the Internet has exploded over the past fifteen years, recently reaching over a billion users, dozens of national governments 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, the authors describe the mechanisms of filtering and circumvention and evaluate ten projects that develop tools that can be used to circumvent filtering. These tools were evaluated in 2007 -- using both tests from within filtered countries and tests within a lab environment -- for their utility, usability, security, promotion, sustainability, and openness.
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 Many of the findings of the report are now out of date, but we present them now, as is, because we think that the broad conclusions of the report about these tools remain valid and because we hope that other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.
The authors 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. The authors 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.
Responses from developers of the tools in question are included in the report.
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Selected mentions:
- The Tor Project responds to the report on its blog.
- The Citizen Lab, developer of Psiphon, points to a story about the report in the MIT Technology Review.
- Berkman Fellow Isaac Mao references the report in a consideration of technical and social methods of censorship and circumvention.
