[tor-bugs] #6232 [Analysis]: Make entropy-over-time graph

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Mon Jul 16 17:12:00 UTC 2012


#6232: Make entropy-over-time graph
-------------------------+--------------------------------------------------
 Reporter:  arma         |          Owner:              
     Type:  enhancement  |         Status:  needs_review
 Priority:  normal       |      Milestone:              
Component:  Analysis     |        Version:              
 Keywords:               |         Parent:              
   Points:               |   Actualpoints:              
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Comment(by robgjansen):

 Replying to [comment:29 asn]:
 > Replying to [comment:28 robgjansen]:
 > > We are still missing the graph where each of the plots are represented
 as a percentage, computed as: (entropy / max_entropy). See my first post
 above.
 >
 > Say, if the entropy of the current consensus is 8 bits, and the maximum
 possible entropy is 11 bits, do you think that 70% would be the correct
 figure in this case? It seems like that the logarithmic scale gives us an
 overrated percentage.
 >
 > Maybe we should transform the values to the linear scale (`2^8/2^11`) to
 get a more intuitive percentage. Or is there a better way to represent
 this comparison?

 I don't understand your opposition, but it shows that the meaning of
 entropy to describe anonymity is not well understood. (I've been asking
 'WTF does entropy mean?' all along.)

 Read [http://www.freehaven.net/anonbib/cache/Diaz02.ps.gz this paper],
 particularly Section 3.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6232#comment:30>
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