Nymble: Blocking System

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Nymble Blocking System is a IEEE research paper.

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Nymble: Blocking System

  1. 1. 1
  2. 2.  Introduction Nymble Properties System Architecture Security Model Limitations Conclusion Nymble Blocking System 3
  3. 3.  Anonymous network o IP hiding facilities o Polipo, Tor, USAIP Users misuses this network for abuse They deface popular websites Websites cannot blacklist individual IP address They blacklist entire anonymizing network Nymble Blocking System 4
  4. 4.  In pseudonymous credential systems Users are added to a blacklist Weak in anonymity In anonymous credential system Group signatures Lacks scalability Nymble Blocking System 5
  5. 5.  A system that allows websites to selectively blacklist users of anonymizing networks. Blocks user without users IP-address. Legitimate users enjoy anonymity. Blacklisted users got blocked for future connections. Previous connections remain unlinkable. Nymble Blocking System 6
  6. 6.  Anonymous Authentication Backward Unlinkability Subjective Blacklisting Nymble Blocking System 7
  7. 7.  Fast Authentication Speeds Rate-Limited Anonymous Connections Revocation Auditability Nymble Blocking System 8
  8. 8.  User The Pseudonym Manager The Nymble Manager Server Nymble Blocking System 9
  9. 9. Fig. The Nymble system architecture showing the various modes of interaction Nymble Blocking System 10
  10. 10. Fig: The Nymble system architecture showing how a user is blacklisted Nymble Blocking System 11
  11. 11. Nymble Blocking System 12
  12. 12. Aims four security goals Blacklistability Rate-limiting assures Nonframeability Anonymity Nymble Blocking System 13
  13. 13.  Sybil attack Mimics IP based blocking Availability of multiple IP address helps users circumvent the system Nymble Blocking System 14
  14. 14.  Nymble is comprehensive credential system. Add a layer of accountability to any publicly known anonymizing network. Servers blacklist misbehaving users maintaining their privacy. Increase the mainstream acceptance of anonymizing network. Nymble Blocking System 15
  15. 15.  www.airccse.org www.torproject.org www.sciencedirect.com www.wikipedia.com Nymble Blocking System 16
  16. 16. Nymble Blocking System 17

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