Abstract
We introduce the concept of a web-based online scanning service, or OSS for short, and show that these OSSes can be covertly used as proxies in a censorship circumvention system. Such proxies are suitable both for short one-time rendezvous messages and bulk bidirectional data transport. We show that OSSes are widely available on the Internet and blocking all of them can be difficult and harmful. We measure the number of round trips and the amount of data that can be pushed through various OSSes and show that we can achieve throughputs of about 100 KB/sec. To demonstrate the effectiveness of our approach we built a system for censored users to communicate with blocked Tor relays using available OSS providers. We report on its design and performance.
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References
The OpenNet Initiative: OpenNet Initiative Internet censorship data (November 2011), http://opennet.net/research/data
Dingledine, R., Mathewson, N., Syverson, P.: Tor: The second-generation onion router. In: Proceedings of the 13th USENIX Security Symposium (August 2004)
Wustrow, E., Wolchok, S., Goldberg, I., Halderman, J.A.: Telex: Anticensorship in the network infrastructure. In: Proc. 20th USENIX Security Symposium (2011)
Feamster, N., Balazinska, M., Harfst, G., Balakrishnan, H., Karger, D.: Infranet: Circumventing web censorship and surveillance. In: Proceedings of the 11th USENIX Security Symposium (2002)
Ultrareach Internet Corp.: Ultrasurf proxy, http://www.ultrasurf.us/
Fifield, D., Hardison, N., Ellithorpe, J., Stark, E., Boneh, D., Dingledine, R., Porras, P.: Evading censorship with browser-based proxies. In: Fischer-Hübner, S., Wright, M. (eds.) PETS 2012. LNCS, vol. 7384, pp. 239–258. Springer, Heidelberg (2012)
Weinberg, Z., Wang, J., Yegneswaran, V., Briesemeister, L., Cheung, S., Wang, F., Boneh, D.: StegoTorus: a camouflage proxy for the Tor anonymity system. In: ACM Conference on Computer and Communications Security, pp. 109–120 (2012)
Kadianakis, G., Mathewson, N.: Obfsproxy architecture (December 2011), https://www.torproject.org/projects/obfsproxy
Appelbaum, J., Mathewson, N.: Pluggable transports for circumvention (October 2010), https://gitweb.torproject.org/torspec.git/blob/HEAD:/proposals/180-pluggable-transport.txt
Twitter: FAQs about Twitter’s link service, https://support.twitter.com/entries/109623
Josefsson, S.: The base16, base32, and base64 data encodings. RFC 4648 (Proposed Standard) (October 2006)
Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., Berners-Lee, T.: Hypertext transfer protocol – HTTP/1.1 (1999)
Jacobs, I., Chisholm, W., Vanderheiden, G.: HTML techniques for web content accessibility guidelines 1.0. Technical report, W3C (December 2000), http://www.w3.org/TR/2000/NOTE-WCAG10-HTML-TECHS-20001106 , latest version available at http://www.w3.org/TR/WCAG10-HTML-TECHS/
Leech, M., et al.: SOCKS protocol version 5 (1996)
PDFmyURL: Over usage (limited use) (October 2011), http://support.pdfmyurl.com/topic/getting-help-overusage
Fifield, D., Allaire, A.: Ticket #7559: Registration via indirect URL request (March 2013), https://trac.torproject.org/projects/tor/ticket/7559
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Fifield, D., Nakibly, G., Boneh, D. (2013). OSS: Using Online Scanning Services for Censorship Circumvention. In: De Cristofaro, E., Wright, M. (eds) Privacy Enhancing Technologies. PETS 2013. Lecture Notes in Computer Science, vol 7981. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-39077-7_10
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DOI: https://doi.org/10.1007/978-3-642-39077-7_10
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