This guide I just used used allows a Linux user to disable the password and enable SSH keys to manage logins to an SSH server. http://lani78.com/2008/08/08/generate-a-ssh-key-and-disable-password-authentication-on-ubuntu-server/. This is very useful, you can access your machine remotely and without requiring the user to remember a complex password. if you are on Windows, the Bitvise SSH client can import the SSH key from your Linux server without problems and allow you to connect over a proxy: http://www.bitvise.com/ssh-client-download. I had problems using Putty, but this utility works perfectly.