On 1/13/2012 4:10 PM, Mike Perry wrote:
I'm unclear. How does Tor ( in TBB) prevent trackers (beacons, web bugs) from gathering & transmitting data, once these are loaded w/ web pages? If there something in Tor that prevents these from phoning home? If so, how? It's been mentioned about the discussion fromThus spake Greg Kalitnikoff (kalitnikoff@xxxxxxxxxxxxxxxx):P.S. Also reading https://www.torproject.org/projects/torbrowser/design/ I found this: "Filter-based addons such as AdBlock Plus, Request Policy, Ghostery, Priv3, and Sharemenot are to be avoided." But here https://lists.torproject.org/pipermail/tor-talk/2011-November/022052.html we see Andrew Lewman`s "In my world, I'd replace noscript with requestpolicy". I`m a bit confused :-/There should be no need to use filters to address 3rd party linkability with a proper implementation of the requirements in https://www.torproject.org/projects/torbrowser/design/#privacy To my knowledge, the only remaining 3rd party direct linkability risk is through HTTP Keepalive (Section 3.5.6), but this linkability is limited to a 20 second window. There is a risk of first party linkability through redirects (Section 3.5.7). This one will be harder to solve, but it is more noticable attack. There are also fingerprinting risks involving time that need to be addressed (3.6.6 and 3.6.7), but the verdict is not in as to exactly how much info these provide in practice. Regardless, we should also have some level of mitigation in place for Tor Browser 2.3.x. It is my opinion that these remaining threats do not justify the need for filters, and that we should focus on eliminating these few remaining issues rather than trying to design a filter mechanism that isn't full of fail.
https://www.torproject.org/projects/torbrowser/design/#privacy
"Filter-based addons such as AdBlock Plus <https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/>, Request Policy <http://requestpolicy.com/>, Ghostery <http://www.ghostery.com/about>, Priv3 <http://priv3.icsi.berkeley.edu/>, and Sharemenot <http://sharemenot.cs.washington.edu/> are to be avoided. We believe that these addons do not add any real privacy to a proper implementation <https://www.torproject.org/projects/torbrowser/design/#Implementation> of the above privacy requirements <https://www.torproject.org/projects/torbrowser/design/#privacy>, as all third parties are prevented from tracking users between sites by the implementation."Side note - In TBB, the preference "network.http.sendRefererHeader" comes w/ default setting to send referer header info (I believe that wasn't always the case). With this default setting, doesn't that allow websites to identify the site you just came from if you click a link?
And haven't I read that all ads aren't necessarily JUST ads? Thanks. _______________________________________________ tor-talk mailing list tor-talk@xxxxxxxxxxxxxxxxxxxx https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk