Copy the RSA or DSA key over to the remote system. It is important that you install and startup the rsyncd server on that remote system before doing this copy. To copy the key use the following commands:
$ rsync -av id_rsa.pub pw7:.ssh/authorized_keys
test@pw7's password: *******
sending incremental file list
id_rsa.pub
sent 488 bytes received 37 bytes 95.45 bytes/sec
total size is 396 speedup is 0.75