[tor-bugs] #6232 [Analysis]: Make entropy-over-time graph
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Tue Jul 10 12:56:02 UTC 2012
#6232: Make entropy-over-time graph
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Reporter: arma | Owner:
Type: enhancement | Status: needs_information
Priority: normal | Milestone:
Component: Analysis | Version:
Keywords: | Parent:
Points: | Actualpoints:
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Comment(by robgjansen):
Replying to [comment:19 robgjansen]:
> Replying to [comment:18 gsathya]:
>
> > I also have Rob's entropy calculation based on the probability that a
country might be chosen(bw of all relays in a particular country/total bw
of all relays of all countries), but I have no idea what to call it. Also,
should this be 1 value per consensus or 1 value per country per consensus?
> >
Sorry, I need to start doing preview before submitting my comments. I've
corrected my comment below.
> Let b_i be the bw of all relays in country i
> Let s be the total bandwidth of all relays
Let p_i be b_i / s (i.e. the probability that a selected relay belongs to
country i)
> Compute this for all countries i
>
> The entropy of this particular consensus is then computed as:
> - ( sum_(all i) p_i log_2 (p_i) )
>
> [note there is a negative sign in front of the sum]
>
> You could call this the diversity of a consensus in the face of a
national level adversary. Does this make sense?
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6232#comment:20>
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