Documentation

Defence & Hardening

System security, network hardening and defence-in-depth strategies.

Hardening SSH: 10 practical steps

ed25519 keys, fail2ban, MFA, commented sshd_config: secure remote access to your Linux server.

9 min read

3-2-1 Backup against ransomware

The 3-2-1 rule, immutable backups and recovery tests that save an SME.

8 min read

OT Security: insights from ManUSec 2026

Why industrial systems are not protected like IT: ICS threats, segmentation, zero-trust on the factory floor.

11 min read