#SFTP tips by 813gan v1
# https://wiki.archlinux.org/index.php/OpenSSH
# https://wiki.archlinux.org/index.php/SSH_keys

#in /etc/ssh/sshd_config you need to have followng lines:

PasswordAuthentication no #disable passwords
#add next line AFTER generating and updating SSH keys
ChallengeResponseAuthentication no #disable interactive password
PubkeyAuthentication yes #enable pub-key auth
PermitRootLogin no
Protocol 2 #disable insecure SSH v1

also consister using nonstandard port (default is 22)