When the final layer is decrypted, the message arrives at its destination. The encrypted data is transmitted through a series of network nodes called " onion routers," each of which "peels" away a single layer, revealing the data's next destination. In an onion network, messages are encapsulated in layers of encryption, analogous to the layers of an onion. Onion routing is a technique for anonymous communication over a computer network. Router B sends it to Router C, which removes the final layer of encryption and transmits the original message to its destination. Router A sends it to Router B, which decrypts another layer to learn its next destination. In this example onion, the source of the data sends the onion to Router A, which removes a layer of encryption to learn only where to send it next and where it came from (though it does not know if the sender is the origin or just another node).
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