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Re: [tor-bugs] #13445 [Tor Browser]: Adjust TBB window size
#13445: Adjust TBB window size
-----------------------------+----------------------
Reporter: cypherpunks | Owner: tbb-team
Type: enhancement | Status: new
Priority: normal | Milestone:
Component: Tor Browser | Version:
Resolution: | Keywords:
Actual Points: | Parent ID:
Points: |
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Comment (by gacar):
According to very simplistic calculations, it'd be slightly worse than the
existing case:
Without any resizing, entropy of the screen resolution distribution: 5.61
bits, # of bins: 27471, # of data points: 2,996,391.
With different resizing parameters:
TBB max width, Entropy (bits), # of bins (anon. sets), Screen utilization
(TBB area/screen area)
============
1000px: 2.79 bits, 87 bins, %57.87 (current countermeasure)
1200px: 3.12 bits, 108 bins, %63.96
1400px: 3.23 bits, 133 bins, %67.15
Also to note, the biggest anon. set for the max_w = 1400px case is
1400x900. This means, a lot people with 1400+ horizontal resolution would
benefit from this change, without being easily identifiable.
5 Largest anonymity sets for max_w = 1400
==============
1400x900, 710369
1200x600, 698672
1400x700, 397267
1200x800, 351765
1400x1000, 300197
5 Largest anonymity sets for max_w = 1000
==============
1000x600, 902896
1000x900, 711738
1000x700, 443070
1000x800, 381586
1000x1000, 314155
But let me take a few days more to plot the anonymity set distributions
with respect to different resizing parameters, as the overall entropy
doesn't tell much about the details of the distribution.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13445#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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