Issues in removing password login Raspberry Pi 3 Model B V1.2

Question

NOTE : I have referenced lot of websites and referenced stack overflow answers but its not working for me

I have set up ssh login for my Raspberry Pi 3 Model B V1.2 and its working like a breeze.

Now I want to make it more secure by removing password login for my pi user. So, I did the following changes in the file /etc/ssh/sshd_config

From

#PasswordAuthentication Yes

To

PasswordAuthentication no

Save and exit the file

Then

sudo service ssh restart

Even tried rebooting the Pi

But when I connect with other devices its prompting for Password, which it must not happen.

It must not allow any prompts for password and must show error. How can I achieve this?

References:

https://steve.dynedge.co.uk/2012/05/30/logging-into-a-rasberry-pi-using-publicprivate-keys/

https://dvpizone.wordpress.com/2014/03/02/how-to-connect-to-your-raspberry-pi-using-ssh-key-pairs/

Answer 1

If you want to fully disable password-based authentication, set BOTH PasswordAuthentication and ChallengeResponseAuthentication to no.

Answer 2

If you look here, you can set how users authenticate themselves (the order of the authentications used). Just set AuthenticationMethods to publickey, it should not be going to a password. Use this in combination with the other answer (disable password authentication).