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Re: [tor-talk] Vidalia+Tor separtely from TBB`s Firefox

On 1/13/2012 4:10 PM, Mike Perry wrote:
Thus 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
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

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

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.

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 from
"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?


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