The main idea behind having a Password Less SSH LOGIN is to be more secure over the internet.
The idea comes from encryption. A set of Public and Private Keys are generated.
The public key stays on the serve rand the private key stays with the user. Only they private key can talk to the public key.
The user needs to upload the public key to the server on
~/.ssh folder and name the file as authorized_keys2
To get the keys working make sure the folder permissons are set correct.
chmod 700 ~/.ssh
chmod 644 ~/.ssh/authrozied_keys2