Nymble: Blocking
Misbehaving Users in Anonymizing Networks – J2EE – dependable and secure
computing
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 Web sites. Web site 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. Our system is thus agnostic to different servers’
definitions of misbehavior-servers can blacklist users for whatever reason, and
the privacy of blacklisted users is maintained.
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