do a google search for 'passwordless ssh' or 'ssh keygen.'
there are a hundred tutorials on how to create an ssh key-pair that you can use instead of passwords.
Most tell you to set a password for the key pair. That may defeat your purpose, but it's to prevent someone from using your key pair if they can get the 2 files. If you don't set a password for the keypair, anyone who can get them will be able to log in to those particular systems as you. You have to weigh the pros and cons of not setting a password for your keypair.