International Journal of Modern Engineering Research (IJMER)
Nymble is a system that allows websites to selectively blacklist the users of anonymizing networks such as Tor without knowing the user's IP-address. Users not on the blacklist enjoy anonymity while the blacklisted users are not allowed future connections for duration of time while their previous connections remain unlinkable. Nymble is based on two administratively separate \"Manager\" servers, called the Pseudonym Manager (PM) and the Nymble Manager (NM). The PM is responsible for pairing a user's IP address with the pseudonym deterministically generated based on the user's IP address. The NM pairs the user's pseudonym with the target server.