How does anonymity of tor work? For example, government want to find somebody who uses tor. We will call him X. He visited site Z. He used tor. Government asks ip of exit node from Z and gets it. Traffic from exit node to Z is unencrypted. Exit node connects with second node with key. Is it unique (own) key for every second node or all second nodes which are connected with exit node have one and same key? If key is unique, can government see what second node made ask to exit node to Z and that way know what first (entry) node made ask to second. And that way find ip of X. How will government know which second nodes were connected with exit node? It will ask it from provider. Is it real to find X that way or not? I don't understand all aspects of Tor's work. Hope, asked a question clearly. Thanks.