Linux Hint shows you how to disable password login on Linux.
How to disable password login on Linux
Depending on your physical environment and other factors like your security policy, the ssh key authentication method may be recommendable over password login. Since the password isn’t sent to the server to authenticate, this method is safer before Man in the Middle or sniffing attacks; it is also a great way to prevent ssh brute force attacks. How to disable password login on Linux is explained in this article.
