Enable Passwordless Authentication with ssh
===

How can I enable password less authentication with SSH. 

This is what I have when I was looking for /.ssh folder.


    bash-3.00$ cd ~/.ssh
    bash-3.00$ pwd
    /home/uname/.ssh
    bash-3.00$ ls -lt
    total 2
    -rw-r--r--   1 uname   gid-uname     489 Jul 26 18:55 known_hosts


And I don't know what next I have to do here? I need to change the permission of `known_hosts` folder? Or something else?