Why SSH Keys Beat Passwords for Server Security, Explained by a Breach Survivor

A self-taught systems administrator who transitioned from a 15-year legal career discovered the hard way that logging into servers via SSH with a username and password leaves them dangerously exposed. Automated bots continuously scan the internet, attempting password combinations on servers worldwide, making even strong passwords a liability if they are ever leaked or reused. The administrator's server was successfully breached before he switched to SSH key-based authentication, which requires an attacker to physically obtain the private key rather than simply guess credentials. Unlike password logins, SSH key pairs are not transmitted over the network in a way that can be brute-forced remotely, making them significantly more secure. Tools like fail2ban offer some protection against repeated login attempts but are considered less reliable than disabling password authentication entirely in favor of SSH keys.