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Sybil attacks target the weaknesses in the reputation system. How does Tor deal with such attacks? Recently, the Lizard Squad tried to take control of the Tor network by creating a large number of nodes, but the attack failed. However, is Tor vulnerable to more sophisticated forms of Sybil attacks?

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Lizard Squad was a pretty noisy sybil. We have monitoring for events of that sort...

https://gitweb.torproject.org/doctor.git/tree/sybil_checker.py

Naturally that event has sparked interest in more sophisticated sybil detection...

https://lists.torproject.org/pipermail/tor-dev/2015-January/008156.html
https://lists.torproject.org/pipermail/tor-dev/2015-January/008095.html

If you're interested in helping we'd love to have you. This is an area that could certainly use more development attention.

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  • I am interested in helping. Perhaps pattern recognition in Relay names and addresses is the next step (used in conjunction with fingerprint check). If you have already something, I'am all ears.
    – Linostar
    Feb 13, 2015 at 7:10
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    Great! Please subscribe to tor-dev@ and ask there (lists.torproject.org/cgi-bin/mailman/listinfo/tor-dev). Philipp Winter has given the most thought to sybil detection but no doubt he would love to have some help!
    – Damian
    Feb 14, 2015 at 17:19

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