Anonymity&Monitoring: How to Monitor the Infrastructure of an Anonymity System

M. Mulazzani, M. Huber, E. Weippl:
"Anonymity&Monitoring: How to Monitor the Infrastructure of an Anonymity System";
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews,40(2010), 5; S. 539 - 546.

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The Tor network is a widely deployed anonymity system on
the Internet used by thousands of users every day. A basic monitoring
system has been designed and implemented to allow long term statistics,
provide feedback to the interested user and to detect certain attacks
on the network. The implementation has been added to TorStatus, a
project to display the current state of the Tor network. During a period
of six months this monitoring system collected data, where information
and patterns have been extracted and analyzed. Interestingly, the Tor
network is very stable with more than half of all the servers located in
Germany and the US. The data also shows a sinusoidal pattern every 24
hours in the total number of servers.