Proceedings [PDF] - Measurement and Analysis of P2P Activity ...

International Conference Advances in the Analysis of Online Paedophile Activity Paris, France; 2-3 June, 2009
3.2 Number of paedophile files
Figure 2 presents, the evolution of the number of distincts
paedophile file-id (vertical axis) observed during
our measurements as a function of time (horizontal axis)
represented by the number of sessions. We assumed
that a file is a paedophile one if its name contains at
least one paedophile keyword.
4. ONGOING AND FUTURE WORK
We are planning to perform a new experiment using
multiple distributed clients using the PlatnetLab platform
and with one session. These measures will give
partial views of the network. We plan to use them
to estimate the real value of several parameters such
as : the number of paedophile files and the number
of copies of a particular paedophile file. We will use
the multiple-recapture model [3] for these estimations.
The multiple-recapture model is used to estimate the
unknown size of a population using multiple samples.
Until now, we have installed our client on 94 PlanetLab
machines. We have collected measures simultaneously
from all these machines. These collected measures are
under study. The next step is to analyse the results
in order to determine if there is a positive or negative
dependency between the results obtained by each client
and to determine if the results are homogeneous.
Figure 2: Evolution of the number of paedophile
files found during the measurements.
Here we found that this curve is growing like Figure
1. Similary, we can’t discover all paedophile files
during our measurement. Here, we detected 701 857
paedophile files.
3.3 Ages contained in filenames
Figure 3 represents the distribution of ages found in
the filenames obtained during our measurement. It describes
the percentage of the occurences (vertical axis)
for each age (horizontal axis) in the filenames viewed
during our measurement. There are 77 030 filenames
that contains an age.
5. ACKNOWLEDGEMENT
This work is supported by the European MAPAP
(SIP-2006-PP-221003) and the French ANR/MAPE projects.
6. REFERENCES
[1] F. Aidouni, M. Latapy, and C. Magnien. Ten
weeks in the life of an edonkey server. Proceedings
of HotP2P’09, 2009.
[2] E. Adar and B.A. Huberman. Free riding on
gnutella. First Monday, vol. 5, 2000.
[3] Z. Schnabel. The estimation of the total fish
population of a lake. Am Math Monthly, 1938.
Figure 3: Ages distribution in filenames.
We observe that the interval of ages ranges from 0
years old up to 20, with an important focus between 8
and 15 years old and two peaks, at 9 and 12 years old.
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