Creating Obstacles to Screened networks

In this paper the proposed system
adds a layer of accountability to any publicly known
anonymizing network is proposed. Servers can blacklist
misbehaving users while maintaining their privacy, and
this system shows that how these properties can be
attained in a way that is practical, efficient, and
sensitive to the needs of both users and services. This
work 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. In future the Nymble
system can be extended to support Subnet-based
blocking. If a user can obtain multiple addresses, then
nymble-based and regular IP-address blocking not
supported. In such a situation subnet-based blocking is
used. Other resources include email addresses, client
puzzles and e-cash, can be used, which could provide
more privacy. The system can also enhanced by
supporting for varying time periods.