Detecting TOR users

Posted by Nico Golde in hacks & code
Thursday, December 21. 2006

Today I saw that there is a very simple but cool method to detect users of http://tor.eff.org/.
Of course Tor doesnt claim to be undetectable but encrypted an anonymous access to the web.

I hope noone uses this as a chance to deny access to web sites for anonymous users.
The test is pretty easy and is done via CSS and JS.

Test yourself: http://ha.ckers.org/weird/privoxy-test.html

[via ha.ckers.org]

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Privoxy does not necessarily (not even closely) imply Tor use.
Besides, on a GNU/Linux system, Firefox 1.5, privoxy+Tor and the check returns "You no not seem to be using privoxy". So it's broken in the first place.
Also, Tor provides a way to detect all exit nodes so there is really no need for something like that anyway:
http://tor.eff.org/faq-abuse.html.en#Bans

#1 blindcoder (Homepage) on 2006-12-22 09:41 (Reply)

Technically, this is a way for an embedded javascript to detect tor, but not the actual site.
Still, I suppose it is possible to provide feedback to the site. Although, of course, that is fairly simple to block.

#2 espresso (Homepage) on 2007-04-16 11:09 (Reply)

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