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I don't think that's totally true. At least, it's maybe superficially true but not in a real world sense. The entry node can see your IP by virtue of the incoming TCP connection and it's not hard to figure out if an IP is a Tor relay or not. The list of known relays is a list that you can just go and get. If it's not a relay, then it's a client, and you're the entry node.

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No, this is not the timing attack I was thinking of. Your version of timing attack comes from inside tor network and that is solved by Entry Guards. And besides you can also be Tor relay and a client. This attacks are just bugs that are fixed.

The real timing attack that is not fixed and will not be (it is not in threat model), is when your ISP works with police (that has warrant) and gives them data. And police also controls server or exit node.

Possibly you replied to the wrong post; I don't know anything about timing attacks. My post was about whether the entry node knows that it's the entry node.

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