This howto shows how to generate a certificate to achieve ssh login without password:
jsmith@local-host$ [Note: You are on local-host here]
jsmith@local-host$ ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] Enter passphrase (empty for no passphrase): [Press enter key] Enter same passphrase again: [Pess enter key] Your identification has been saved in /home/jsmith/.ssh/id_rsa. Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 jsmith@local-host
jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host jsmith@remote-host's password: Now try logging into the machine, with "ssh 'remote-host'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.
jsmith@local-host$ ssh remote-host Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 [Note: SSH did not ask for password.] jsmith@remote-host$ [Note: You are on remote-host here]