Paper 2015/235

Performance and Security Improvements for Tor: A Survey

Mashael AlSabah and Ian Goldberg


Tor [Dingledine et al. 2004] is the most widely used anonymity network today, serving millions of users on a daily basis using a growing number of volunteer-run routers. Since its deployment in 2003, there have been more than three dozen proposals that aim to improve its performance, security, and unobservability. Given the significance of this research area, our goal is to provide the reader with the state of current research directions and challenges in anonymous communication systems, focusing on the Tor network.We shed light on the design weaknesses and challenges facing the network and point out unresolved issues.

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Preprint. MINOR revision.
Privacy-enhancing technologiesanonymity networksperformance
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malsabah @ qu edu qa
2016-05-11: last of 2 revisions
2015-03-13: received
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      author = {Mashael AlSabah and Ian Goldberg},
      title = {Performance and Security Improvements for Tor: A Survey},
      howpublished = {Cryptology ePrint Archive, Paper 2015/235},
      year = {2015},
      note = {\url{}},
      url = {}
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