Authenticating By Public Key In Open SSH

To setup public-key authentication between an OpenSSH client and OpenSSH server.

• Generate key on client_machine

  client_machine$mkdir -p ~/.ssh
  client_machine$chmod 700 ~/.ssh
  client_machine$cd ~/.ssh
  client_machine$ssh-keygen -t dsa

• Copy the public key to the remote machine.

  $scp -p id_dsa.pub user@remote_server:/home/user/.ssh/authorized_keys
  Password

         p   Preserves modification times, access times, and modes from the
             original file.

• Login to the remote server and make the following changes.

  remote_server$chmod 700 ~/.ssh
  remote_server$chmod 600 ~/.ssh/authorized_keys
  remote_server$logout