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SSH passphrases and keys

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You then need to put the public key (.ssh/id_dsa.pub by default) into the authorized_keys2 file on the server. Once that's done, if you attempt an ssh to the server, you'll be asked for your passphrase rather than the password of the user on the server. Here's the most important thing to understand at this point: The password at the server doesn't matter anymore. You could log into the server and change the password, and ssh is still going to let you in because of the public key and the passphrase you've provided. You could even edit (as root, of course) /etc/shadow on the server and put a * in the password field, which would mean that no password could EVER be used to login as that user, but you could still login as that user using ssh and your key files/passphrase.

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Tony Lawrence

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