AW: [suse-security] rsync and automatics backups over ssh

i am thinking for using rsync over ssh. but i have a problem, the sys ask me for writting the ssh password. there is any method using rsync and ssh for sending the password whitout writte it? my plan is to use rsync over ssh in a cron.

I use public key authentication with a null passphrase for the private key on the client machine. Tobias