One of rlogin's authentication methods is to have a list of hosts and usernames that are allowed to log in. If you're on the list, you're in. How does it know y

One of rlogin's authentication methods is to have a list of hosts and usernames that are allowed to log in. If you're on the list, you're in. How does it know you're actually using that username? Well, it asks your host, which would definitely never lie.