pull files from window server to aix box

Hi All,
I have a new requirment where i have to pull files from windows server to aix box. I am using scp command to pull a files. command is working fine but it is asking password for everytime i m running this command.I want to automate this so that it will not ask any password.
Do i need to enable public kew between these two servers or there are other things i need to follow,please help me if you have any idea,it will be very helpful for me.

Thanks in advance.

Search for the forum with password-less scp.
Its discussed already.