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SSH:using single public key on multiple remote machines and spoofing-by-known-server

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http://serverfault.com – Lyrics Usually, people say, that using single public key on several servers is just as secure as using unique public keys on each of them. (If we're not talking about possibility of private key being compromised) But... I don't get, if it's possible to "spoof your authentication" in the following case: Preconditions Suppose you're a happy owner of PC-1. There's also a Server-1 and Server-2, and they share the same public key. Server-1 is aware of existence of Server-2, but you don't want Server-1's admin to be able to steal your data from Server-2. So, what's wrong here: PC-1 tries to c (HowTos)