onion routing

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onion routing

A method for anonymous communications over a wide area network such as the Internet. It hides the names of the parties that are communicating as well as the data by encrypting the payload in layers, with a different encryption layer for each hop in the route. Using cooperating proxy routers throughout the network, the initiating onion router, called a "Tor client" in the Tor (The Onion Router) system, determines the path and encrypts the layers using the different public keys of each router. It also encrypts the destination for the next hop in each layer. Each router decrypts the payload with its private key, unpeeling the message like an "onion" and sending the data to the next router after the next hop is decrypted and revealed. See Tor, anonymous Web surfing and anonymous remailer.


Create the Layers and "Unpeel" Them
Each router in an onion routing system "unpeels the onion," revealing the next router address and the next set of data to be encrypted.
References in periodicals archive ?
FiLS-MPLS includes LDP for hop-by-hop LSPs, and both CR-LDP and RSVP modules to create traffic engineered paths in the network.
MPLS replaces the hop-by-hop, individually routed packet model with a connection-oriented model that establishes "paths" to destinations.
By allowing IP to take advantage of switching technologies such as ATM, the CSR provides high speed switching of IP packets by setting up cut-through paths directly through the network for long life IP traffic and avoids the hop-by-hop processing delays incurred when using conventional routers.