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 "/cygdrive/c/cygwin/home/pjones/.ssh/id_rsa.pub" pw7:.ssh/authorized_keys
pjones@pw7's password: *******
sending incremental file list
id_rsa.pub
sent 496 bytes received 31 bytes 42.16 bytes/sec
total size is 395 speedup is 0.75