[07] DOES SDF SUPPORT SSH AUTHORIZED_KEYS FOR AUTHENTICATION?

    Yes, to set this up on a Unix system, please follow the steps below.
    Windows users might want to read about PuTTY Key Generator instead.

    1. Run 'ssh-keygen -t rsa' on your host (the machine you plan to login
       from). This will create a public key "id_rsa.pub" and private key
       "id_rsa" under $HOME/.ssh . You have the option of protecting your
       private key with a password, in the event that the $HOME directory
       on your host is ever breached.
       (Note: other types of keys, like DSA and ED25519, are not known to
       work at present.)

    2. Log in to SDF, and put the contents of your newly-created *.pub key
       in the file $HOME/.ssh/authorized_keys (create it if it does not
       already exist).

    3. Set the appropriate permissions on $HOME/.ssh
       (Run 'chmod -R 700 $HOME/.ssh' so that group and world on SDF
       cannot read the directory).

    4. Return to the machine you plan to login from, and create the file
       $HOME/.ssh/config containing the following stanza. Replace ${LOGNAME}
       with your SDF username.
       Host tty.sdf.org
           Hostname tty.sdf.org
           PreferredAuthentications publickey,keyboard-interactive,password
           IdentitiesOnly yes
           IdentityFile ~/.ssh/id_rsa
           User ${LOGNAME}

    You should now be able to login via ssh without being prompted for a
    password (unless you password-protected your private key, in which case
    you will be prompted for the password by your ssh client).

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