7/25/2019 nymble-120915200250-phpapp01

1/18

1

WELCO

ME

7/25/2019 nymble-120915200250-phpapp01

2/18

BLOCKING

SYSTEM

7/25/2019 nymble-120915200250-phpapp01

3/18

CONTENTS

Introduction

Nymble

Properties System Architecture

Security Model

Limitations

Conclusion

3Nymble Blocking System

7/25/2019 nymble-120915200250-phpapp01

4/18

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

7/25/2019 nymble-120915200250-phpapp01

5/18

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

7/25/2019 nymble-120915200250-phpapp01

6/18

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 -

7/25/2019 nymble-120915200250-phpapp01

7/18

ATUR S

Anonymous Authentication

Backward Unlinkability

Subjective Blacklisting

Nymble Blocking System .

7/25/2019 nymble-120915200250-phpapp01

8/18

ATUR S

Fast Authentication Speeds

Rate-Limited Anonymous onnections

Revocation Auditability

Nymble Blocking System /

7/25/2019 nymble-120915200250-phpapp01

9/18

THE NYMBLE SYSTEM

User

!he "seudonym #anager

!he $ymble #anager

Server

Nymble Blocking System 0

7/25/2019 nymble-120915200250-phpapp01

10/18

SYSTEM ARCHITECTURE

1Nymble Blocking System

2ig+ #he Nymble system architecture shoing the &arious modes o! interaction

7/25/2019 nymble-120915200250-phpapp01

11/18

BLACKLISTING

USER

11Nymble Blocking System

2ig #he Nymble system architecture shoing ho a user is blacklisted

7/25/2019 nymble-120915200250-phpapp01

12/18

Cont

Nymble Blocking System 14

7/25/2019 nymble-120915200250-phpapp01

13/18

SECURITY MODEL

Aims %our security goals

Blacklistability

Rate-limiting assures

$on%rameability

Anonymity

13Nymble Blocking System

7/25/2019 nymble-120915200250-phpapp01

14/18

LIMITATIONS

Sybil attack

#imics &" based blocking Availability o% multiple &" address helps

users circumvent the system

Nymble Blocking System 1(

7/25/2019 nymble-120915200250-phpapp01

15/18

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

7/25/2019 nymble-120915200250-phpapp01

16/18

R R NC S

www'airccse'org

www'torproject'org

www'sciencedirect'com www'wikipedia'com

1-Nymble Blocking System

7/25/2019 nymble-120915200250-phpapp01

17/18

QA

1.Nymble Blocking System

!

7/25/2019 nymble-120915200250-phpapp01

18/18