SCP and SSH without password

To ssh from machine source to destination without system asking you for password follow these instuctions. On source run the command
ssh-keygen -t rsa
You will be asked "Enter passphrase (empty for no passphrase):" . Press Enter.
This command will generate a private key in $HOME/.ssh/id_rsa and a public key in $HOME/.ssh/id_rsa.pub
Transfer the file id_rsa.pub to destination machine (you can use scp/ftp)
At destination append the id_rsa.pub to $HOME/.ssh/authorized_keys using
cat id_rsa.pub >> $HOME/.ssh/authorized_keys
Next time when you ssh from source to destination, you will not be asked for any passwords.