Ssh only key

#On Client:
ssh-keygen -t rsa
scp ~/.ssh/id_rsa.pub username@hostname:~/.ssh/authorized_keys

#On Server (to disable passwords and only allow key)
sudo nano /etc/ssh/sshd_config
#change "PasswordAuthentication yes" --> "PasswordAuthentication no"
#remove "#" in front of the line if present

Source: thomas-krenn.com

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