Passwordless SSH login

[R C]

On 2/10/21 10:18 PM, Bob wrote:
> ** Reply to message from "Bob" <ubuntu-qygzanxc at listemail.net> on Wed, 10 Feb
> 2021 15:49:35 -0800
>
>> I have set up SSH between two computers on my LAN and am trying to disable
>> password login.  SSH works between the computers.  I can login using
>> public/private keys.  What I have not been able to do is disable the password
>> login.
>>
>> The instructions I am using
>> <https://www.linuxbabe.com/linux-server/setup-passwordless-ssh-login> says to
>> edit /etc/ssh/sshd_config and change "PasswordAuthentication" from "yes" to
>> "no" and change "ChallengeResponseAuthentication" to "no".  That did not work
>> as I can still SSH to the computer and login to the computer using the
>> password.
>>
>> When I edit /etc/ssh/sshd_config "PasswordAuthentication" is commented out so I
>> removed the comment and changed "yes" to "no".
>> "ChallengeResponseAuthentication" was not on the config file so I added it.
>> What else do I need to do?
> I think this has gotten off on a tangent.
>
> What I want is to prevent someone logging in the the computer using a password.
>
> I only want to allow a login using an rsa key.
>
Well just set the password to a ridiculously long random password, that 
no one will ever be able to guess, not a 100% guarantee, but probably 
close enough.