Onion routing is a technique for anonymous communication over a
computer network. In an onion network, messages are encapsulated in
layers of encryption, analogous to layers of an onion. The encrypted
data is transmitted through a series of network nodes called onion
routers, each of which “peels” away a single layer, uncovering the
data’s next destination. When the final layer is decrypted, the
message arrives at its destination. The sender remains anonymous
because each intermediary knows only the location of the immediately
preceding and following nodes
