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Cyber Security Academy · Lesson

SSH Hardening and Key-Based Auth

Disable password auth, configure key pairs, restrict access with AllowUsers, and use fail2ban.

Why SSH Security Matters

SSH is the primary remote administration protocol for Linux servers. A misconfigured SSH server is one of the most common entry points for attackers — exposed to the internet and targeted by constant brute-force bots.

Generating an SSH Key Pair

Key-based auth is stronger than passwords. Generate a key pair:

ssh-keygen -t ed25519 -C "your_email"
# Creates ~/.ssh/id_ed25519 (private) and id_ed25519.pub (public)
# Never share the private key

All lessons in this course

  1. File Permissions and Ownership
  2. User and Group Management
  3. SSH Hardening and Key-Based Auth
  4. iptables and UFW Firewall Rules
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