http://nosheep.net/story/password-less-ssh-login/

ssh/sftp/scp from ender to bean without being prompted for a password:

1. Connect to ender
2. type: ssh-keygen -t rsa
   • default directory for keyfiles will be ~/.ssh/
   • if you do not want to be prompted, leave passphrase blank
3. copy the contents of .ssh/id_rsa.pub (there should only be one line)
4. place this line on bean, in ~/.ssh/authorized_keys
5. that’s it, you should now be able to ssh/sftp/scp from ender to bean without being prompted for a password!

-- ZhaohuiSun - 18 Aug 2006

-- LeiYan - 17 Jul 2009