| Disable ssh by password | sed -i 's/PasswordAuthentication yes/PasswordAuthentication no/g' /etc/ssh/sshd_config |
| Disable root login | sed -i 's/^PermitRootLogin yes/#PermitRootLogin yes/' /etc/ssh/sshd_config |
| Enable/Disable SSH Host Key Checking | StrictHostKeyChecking yes change ~/.ssh/config |
| Protect SSH server from brute force attacks | using fail2ban command-line tool |
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