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bklopfer@pm8:~$ ssh rescomp.stanford.edu echo This requires a password.
Password:
This requires a password.
bklopfer@pm8:~$ ssh-copy-id -i .ssh/id_dsa.pub rescomp.stanford.edu
Password:
Now try logging into the machine, with "ssh 'rescomp.stanford.edu'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

bklopfer@pm8:~$ ssh rescomp.stanford.edu echo This is passwordless.
This is passwordless.
bklopfer@pm8:~$