nymble-120915200250-phpapp01
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1
WELCO
ME
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BLOCKING
SYSTEM
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CONTENTS
Introduction
Nymble
Properties System Architecture
Security Model
Limitations
Conclusion
3Nymble Blocking System
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INTRODUCTION
Anonymous netorko IP hiding !acilities
o
Polipo" #or" $SAIP $sers misuses this netork !or abuse
#hey de!ace popular ebsites
%ebsites cannot blacklist indi&idual IPaddress
#hey blacklist entire anonymi'ing netork
(Nymble Blocking System
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Current Strategy
In pseudonymous credential systems$sers are added to a blacklist
%eak in anonymity
In anonymous credential system)roup signatures
Lacks scalability
*Nymble Blocking System
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NYMBLE
A system that allos ebsites to selecti&ely
blacklist users o! anonymi'ing netorks+
Blocks user without user's IP-address. Legitimate users en,oy anonymity+
Blacklisted users got blocked !or !uture
connections+ Pre&ious connections remain unlinkable+
Nymble Blocking System -
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ATUR S
Anonymous Authentication
Backward Unlinkability
Subjective Blacklisting
Nymble Blocking System .
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ATUR S
Fast Authentication Speeds
Rate-Limited Anonymous onnections
Revocation Auditability
Nymble Blocking System /
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THE NYMBLE SYSTEM
User
!he "seudonym #anager
!he $ymble #anager
Server
Nymble Blocking System 0
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SYSTEM ARCHITECTURE
1Nymble Blocking System
2ig+ #he Nymble system architecture shoing the &arious modes o! interaction
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BLACKLISTING
USER
11Nymble Blocking System
2ig #he Nymble system architecture shoing ho a user is blacklisted
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Cont
Nymble Blocking System 14
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SECURITY MODEL
Aims %our security goals
Blacklistability
Rate-limiting assures
$on%rameability
Anonymity
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LIMITATIONS
Sybil attack
#imics &" based blocking Availability o% multiple &" address helps
users circumvent the system
Nymble Blocking System 1(
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CONCLUSION
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.
1*Nymble Blocking System
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R R NC S
www'airccse'org
www'torproject'org
www'sciencedirect'com www'wikipedia'com
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QA
1.Nymble Blocking System
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