NYMBLE: BLOCKING MISBEHAVING USERS IN ANONYMIZING NETWORKS

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Presentation transcript:

NYMBLE: BLOCKING MISBEHAVING USERS IN ANONYMIZING NETWORKS Name: Mohammad Zainuddin GUIDED BY: (10R01D5809) Mr.D.BASWARAJ

Contents Abstract Technical Terms Existing System Proposed System Software and hardware Requirements Conclusion

ABSTRACT: Anonymizing networks such as Tor allow users to access Internet services privately by using a series of routers to hide the client’s IP address from the server. The success of such networks, however, has been limited by users employing this anonymity for abusive purposes such as defacing popular websites. Website administrators routinely rely on IP-address blocking for disabling access to misbehaving users, but blocking IP addresses is not practical if the abuser routes through an anonymizing network. As a result, administrators block all known exit nodes of anonymizing networks, denying anonymous access to misbehaving and behaving users alike. To address this problem, we present Nymble, a system in which servers can “blacklist” misbehaving users, thereby blocking users without compromising their anonymity.

EXISTING SYSTEM Verifier-local revocation (VLR) fixes this shortcoming by requiring the server (“verifier”) to perform only local updates during revocation. Unfortunately, VLR requires heavy computation at the server that is linear in the size of the blacklist. Where VLR is compress of Three algorithms that are KeyGen, Sign, and Verify.

PROPOSED SYSTEM We present a secure system called Nymble Nymble has the following properties: . Anonymous authentication . Backward unlinkability . Subjective blacklisting . Fast authentication speeds . Rate-limited anonymous connections . Revocation auditability

HARDWARE REQUIREMENTS: PROCESSOR : PENTIUM IV 2.6 GHz RAM : 512 MB DD RAM MONITOR : 15” COLOR HARD DISK : 20 GB

SOFTWARE REQUIREMENTS: Front End : Java, RMI, JFC (Swing) Server : apache-tomcat-6.0.18 Backend : Ms-Access Tools Used : Eclipse 3.3 Operating System : Windows XP/7

Conclusion Nymble is a comprehensive credential system which can be used to add a layer of accountability to any publicly known anonymizing network. Servers can blacklist misbehaving users while maintaining their privacy which will increase the mainstream acceptance of anonymizing networks such as Tor, which has thus far been completely blocked by several services because of users who abuse their anonymity.

THANK YOU