[Conan]

Why didn't you add using key authentication?

Also ICMP is much easier to block in iptables.

I made a passwordless tutorial too. But it is not more secure than a complex password. It is just convenient because you do not have to enter your password every time.

Sorry for the necro. I just want to reply on this.

It is MORE SECURE than a complex passwords. It would take years to crack those private keys. Who would want to brute force a 2048bit key?
Passwords are less secure and can easily be bruteforced. No one would dare bruteforce a 2048bit key unless you're a very important person.