Blocking the Misbehaving Access using Ticket Based Method in Anonymous Networks

Nymble is a system that provides a blocking mechanism to a server to protect it from misbehaving users connecting through anonymizing networks such as Tor. Anonymous networks allow anyone to visit the public areas of the network. Here users access the Internet services through a series of routers. , this hides the user’s identities and IP address from the server. This may be an advantage for the misbehaving users to destroy popular websites. To avoid such activities, servers may try to block the misbehaving user, but it is not possible in case of anonymous networks. In such cases, if the abuser routes through an anonymizing network, administrators block all known exit nodes of anonymizing networks, denying anonymous access to misbehaving and behaving users. To overcome this problem, a nymble system is designed in which servers can blacklist the misbehaving users without compromising their anonymity. We have to develop a dynamic linkability window whose length can be increased exponentially. Thus, at the start of each linkability window, all service providers must reset their blacklists and forgive all prior misbehavior.