There are all routers in the network with number 1...N.
Onion Router s has a public key Su and a private key Sr. The public key is well-know to onion proxies. Private keys are only known to the router.
It protects data content and identity by using public key in the proxy table to encrypt the packet like the onion. Intermediate nodes along the path will decrypt the packet using its private key.
Reference: http://ntrg.cs.tcd.ie/undergrad/4ba2.05/group10/index.html
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