To enable a password authentication, you create a password, update the
/etc/ssh/sshd_config file, and then restart the SSH service. The following procedure is tested on Amazon Linux, RHEL, SUSE, and Ubuntu
Note: Using a password-based login rather than key pair authentication has security implications. Therefore, password-based login isn’t recommended. Also, it’s a best practice to minimize the source IP addresses of the security group rules associated with your instance to prevent an SSH attack.