If you somehow gained access to a copy of your privat key, they will gain access to all the servers that trust your key. The most daring users, simply create a public key with a empty passphrase. So we really did not fix the problem, we just shifted the problem, but we shifted it in the right direction, and now we can do something about it. The key is signed by what we call a passphrase, meaning that, when you now access a server that got a copy of your public key it prompt your for your password (passphrase) instead of the system user account password. To enable automatic login to a SSH server, the server must have a copy of your public key. The good news is that’s a simple solution to all this. Tired of typing passwords to SSH servers you often access? Well get used to it! Passwords provide a high level of security, but but it have a tendency be tedious, and also prevent you from running local scripts that automatic logon to your server to perform tasks or you you simply will backup/copy files from your server to your local Mac. Here’s an excellent write-up for setting up SSH access using private keys to connect to other Linux/Unix servers without having to enter a password. Using Private Keys with SSH login Without Password on Mac OS X
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