[tor-commits] [tech-reports/master] Add graphics, fix an error in extrapolation report.
karsten at torproject.org
karsten at torproject.org
Mon Feb 9 17:54:17 UTC 2015
commit 85c141e98e828602bc853e2d96d7db2ad2a85b6b
Author: Karsten Loesing <karsten.loesing at gmx.net>
Date: Mon Feb 9 18:49:49 2015 +0100
Add graphics, fix an error in extrapolation report.
---
2015/extrapolating-hidserv-stats/.gitignore | 1 +
.../extrapolating-hidserv-stats.tex | 16 ++++++++++------
.../graphics/corr-probs-cells-by-relay.pdf | Bin 0 -> 72487 bytes
.../graphics/corr-probs-onions-by-relay.pdf | Bin 0 -> 76829 bytes
.../graphics/extrapolated-cells.pdf | Bin 0 -> 13117 bytes
.../graphics/extrapolated-network-totals.pdf | Bin 0 -> 5247 bytes
.../graphics/extrapolated-onions.pdf | Bin 0 -> 12040 bytes
.../graphics/num-reported-stats.pdf | Bin 0 -> 4804 bytes
2015/extrapolating-hidserv-stats/graphics/overview.odg | Bin 0 -> 18134 bytes
2015/extrapolating-hidserv-stats/graphics/overview.pdf | Bin 0 -> 20330 bytes
.../graphics/probs-by-day.pdf | Bin 0 -> 5568 bytes
.../graphics/probs-by-relay.pdf | Bin 0 -> 11110 bytes
.../extrapolating-hidserv-stats/graphics/sim-cells.pdf | Bin 0 -> 5181 bytes
.../graphics/sim-onions.pdf | Bin 0 -> 5141 bytes
.../graphics/stats-by-day.pdf | Bin 0 -> 11217 bytes
.../graphics/zero-prob-cells.pdf | Bin 0 -> 7169 bytes
.../graphics/zero-prob-onions.pdf | Bin 0 -> 7016 bytes
17 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/2015/extrapolating-hidserv-stats/.gitignore b/2015/extrapolating-hidserv-stats/.gitignore
index 75d2c50..8ae5f9d 100644
--- a/2015/extrapolating-hidserv-stats/.gitignore
+++ b/2015/extrapolating-hidserv-stats/.gitignore
@@ -1,2 +1,3 @@
extrapolating-hidserv-stats.pdf
+extrapolating-hidserv-stats-2015-01-31.pdf
diff --git a/2015/extrapolating-hidserv-stats/extrapolating-hidserv-stats.tex b/2015/extrapolating-hidserv-stats/extrapolating-hidserv-stats.tex
index bef857f..126c79c 100644
--- a/2015/extrapolating-hidserv-stats/extrapolating-hidserv-stats.tex
+++ b/2015/extrapolating-hidserv-stats/extrapolating-hidserv-stats.tex
@@ -46,7 +46,7 @@ network totals.
\begin{figure}
\centering
-\includegraphics[width=.8\textwidth]{overview.pdf}
+\includegraphics[width=.8\textwidth]{graphics/overview.pdf}
\caption{Overview of the extrapolation method used for extrapolating
network totals from hidden-service statistics.}
\label{fig:overview}
@@ -150,10 +150,14 @@ Figure~\ref{fig:extrainfo} are processed to 152599040~cells and 84~.onion
addresses.
For the subsequent analysis we're also converting cells/day to
bits/second by multiplying cell numbers with 512~bytes/cell, multiplying
-with 8~bits/byte, dividing by 86400~seconds/day, and dividing by 2 to
-account for the fact that statistics include cells in both incoming and
-outgoing direction.
-As a result we obtain 3.6~Mbit/s in the given sample.
+with 8~bits/byte, and dividing by 86400~seconds/day.%
+\footnote{The originally published report had another quotient of 2 in
+this calculation, based on the false assumption that we would otherwise
+double-count cells going in incoming and outgoing direction.
+But this is not the case: we're counting each cell going in either
+incoming or outgoing direction only once when relaying it.
+All subsequent results have been fixed accordingly.}
+As a result we obtain 7.2~Mbit/s in the given sample.
Figure~\ref{fig:stats-by-day} shows parsed values after removing
previously added noise.
@@ -264,7 +268,7 @@ In the sample consensus entry, we'd extract the base64-encoded fingerprint
of the statistics-reporting relay, \verb+9Sje0h6...+, and the fingerprint
of the hidden-service directory that precedes the relay by three
positions, \verb+9PodlaV...+, and compute what fraction of descriptor
-space that is, in this case $0.071$.
+space that is, in this case $0.071\%$.
So, the relay has observed $0.024\%$ of descriptors in the network.
% 9Sje0h6... -> F528DED2 -> 4113096402
diff --git a/2015/extrapolating-hidserv-stats/graphics/corr-probs-cells-by-relay.pdf b/2015/extrapolating-hidserv-stats/graphics/corr-probs-cells-by-relay.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/corr-probs-onions-by-relay.pdf b/2015/extrapolating-hidserv-stats/graphics/corr-probs-onions-by-relay.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/extrapolated-cells.pdf b/2015/extrapolating-hidserv-stats/graphics/extrapolated-cells.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/extrapolated-network-totals.pdf b/2015/extrapolating-hidserv-stats/graphics/extrapolated-network-totals.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/extrapolated-onions.pdf b/2015/extrapolating-hidserv-stats/graphics/extrapolated-onions.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/num-reported-stats.pdf b/2015/extrapolating-hidserv-stats/graphics/num-reported-stats.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/overview.odg b/2015/extrapolating-hidserv-stats/graphics/overview.odg
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diff --git a/2015/extrapolating-hidserv-stats/graphics/probs-by-day.pdf b/2015/extrapolating-hidserv-stats/graphics/probs-by-day.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/probs-by-relay.pdf b/2015/extrapolating-hidserv-stats/graphics/probs-by-relay.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/sim-cells.pdf b/2015/extrapolating-hidserv-stats/graphics/sim-cells.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/sim-onions.pdf b/2015/extrapolating-hidserv-stats/graphics/sim-onions.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/stats-by-day.pdf b/2015/extrapolating-hidserv-stats/graphics/stats-by-day.pdf
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diff --git a/2015/extrapolating-hidserv-stats/graphics/zero-prob-cells.pdf b/2015/extrapolating-hidserv-stats/graphics/zero-prob-cells.pdf
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