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Nymble: Anonymous IP-Address Blocking



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Nymble Anonymous IP Address Blocking Peter C Johnson1 Apu Kapadia1 2 Patrick P Tsang1 and Sean W Smith1 1 Department of Computer Science Dartmouth College Hanover NH 03755 USA 2 Institute for Security Technology Studies Dartmouth College Hanover NH 03755 USA pete akapadia patrick sws cs dartmouth edu Abstract Anonymizing networks such as Tor allow users to access Internet services privately using a series of routers to hide the client s IP address from the server Tor s success however has been limited by users employing this anonymity for abusive purposes such as defacing Wikipedia Website administrators rely on IPaddress blocking for disabling access to misbehaving users but this is not practical if the abuser routes through Tor As a result administrators block all Tor exit nodes denying anonymous access to honest and dishonest users alike To address this problem we present a system in which 1 honest users remain anonymous and their requests unlinkable 2 a server can complain about a particular anonymous user and gain the ability to blacklist the user for future connections 3 this blacklisted user s accesses before the complaint remain anonymous and 4 users are aware of their blacklist status before accessing a service As a result of these properties our system is agnostic to different servers definitions of misbehavior 1 Introduction Anonymizing networks such as Crowds 25 and Tor 15 route traffic through independent nodes in separate administrative domains to hide the originating IP address Unfortunately misuse has limited the acceptance of deployed anonymizing networks The anonymity provided by such networks prevents website administrators from blacklisting individual malicious users IP addresses to thwart further abuse they blacklist the entire anonymizing network Such measures eliminate malicious activity through anonymizing networks at the cost of denying anonymous access to honest users In other words a few bad apples can spoil the fun for all This has



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