How do I require a private key for SSH connection?

Hi there, newbie here. I followed a guide via digitalocean for generating an SSH key for my droplet server. However when I log into the server via putty it does not require me to authenticate with my key and I can log in without it. How do I make it so that my key is required for logging in via, say, Putty?

Thanks and best wishes


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In order to make key necessary every time when you ssh you have to make key necessary in sshd_config file which you would find in /etc/ssh/sshd_config most probably.