3 Steps to Perform SSH Login Without Password Using ssh-keygen & ssh-copy-id

http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/

Using SSH and SFTP with PHP

http://phpmaster.com/using-ssh-and-sftp-with-php/?utm_medium=email&utm_campaign=PHPMaster+Newsletter+-+15+January+2013&utm_content=PHPMaster+Newsletter+-+15+January+2013+CID_53181e5e2c127d7e01d0b5ee8e4aae50&utm_source=Newsletter&utm_term=Using%20SSH%20and%20SFTP%20with%20PHP