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http://pdos.csail.mit.edu/p2psim.
2. Tor: Anonymity Online,
http://tor.eff.org/
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4. Cheng, R., Zhang, Y., Bertino, E., Prabhakar, S.: Preserving User Location Privacy in Mobile Data Management Infrastructures. In: Proc. of Privacy Enhancing Technology Workshop (2006)
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