Tor, privacy and anonymous browsing/geek

Posed on Tue, 11 Dec 2007 :: /geek :: link

An interesting discussion appeared on #debian on OFTC regarding TOR. One person was of the view that "many intelligence and other agencies are probably heavily involved in tor". As the discussion continued (yes, I should have pointed out it was OT for the channel...) it appeared that privicy and anonymity were getting confused.

Now, I'm not a huge TOR fan (being an oper on OFTC), but I seriously doubt that government agencies are 'heavily involved'. I was pointed at an article to back this claim up, but the article doesn't. Instead, it (and the original claim) raises a couple of interesting issues.

Firstly, there is a difference between privacy and anonymity, although closely related. Privacy allows you to keep information about yourself secret, and anonymity allows you to keep you yourself secret. In the case linked, although the people browsing were anonymous, and maintained privacy, this was broken when they revealed information about themselves. Breaking this privacy broke their anonymity. TOR doesn't even grantee complete anonymity:

Tor can't solve all anonymity problems. It focuses only on protecting the transport of data. You need to use protocol-specific support software if you don't want the sites you visit to see your identifying information. For example, you can use web proxies such as Privoxy while web browsing to block cookies and withhold information about your browser type. Also, to protect your anonymity, be smart. Don't provide your name or other revealing information in web forms.

[http://www.torproject.org/overview.html.en]

Used properly, TOR can be a very powerful tool to help, but certainly isn't a silver bullet. It needs to be used properly to prevent your identity being known (anonymity). However, without privacy, this is nothing.
Even without these safeguards, it would require significant resources (and may not be possible) to reliably retrieve useful information about one particular person. This leads to the Greater Internet Fuckwad Theory, which is the main issue I have with TOR, but that's a different post.

So, the question is: do you want privacy or anonymity when using the internet? You need to know what you want before you use a tool, as nothing can beat user education on how to keep your browsing details out of the 'wrong hands'.