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Improving Path Selection in Tor Anonymous Network

Momeni Milajerdi, Sadegh | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43618 (19)
  4. University: Sharif University Of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Kharrazi, Mehdi
  7. Abstract:
  8. Today one of the most important challenges of internet is protecting the privacy of its users. Now, there are just a few practical anonymity systems over internet and one prominent is Tor anonymity network that works based on well-known onion routing. Although Tor is designed for providing low latency anonymity, but its users face long delays using this network and most of them do not tolerate these delays. So they leave the network and this leads to decreasing the members of anonymity set and in a smaller anonymity set, it’s easier attacking the network and violating the privacy of users.The most important factor affecting the performance and security of Tor is how selecting a path consisting of three relays. In this research, we introduce a hybrid path selection method that besides selecting relays based on their bandwidths , consider geographical location of them. The great advantage of our work is that it just needs local modifications and does not require a revamp of the entire Tor architecture. Finally we evaluate this method with modeling internet in an experimental environment and simulating normal behavior of users. We show that with changing the procedure of path selection as well as increasing the performance,the anonymity degree will increase too and Tor will be more resistant to attacks.
  9. Keywords:
  10. Privacy ; Anonymity System ; Anonymity Degree ; Tor Network

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