SSH security Archives - ITFROMZERO

Protecting SSH Keys with TPM 2.0 on Linux: Private Keys That Can’t Be Stolen Even with Root Access

By IT From Zero September 8, 2026

A practical guide to protecting SSH private keys with TPM 2.0 on Linux: keys are stored inside the hardware chip and cannot be stolen even if an attacker has root access. Covers installing tpm2-pkcs11, generating keys inside the TPM, and configuring SSH with PKCS11Provider so no key file ever touches disk.

Security

Hardening SSH Server Security with ssh-audit: Eliminating Weak Algorithms for 2024

By IT From Zero May 12, 2026

Don't let your server be compromised by outdated SSH algorithms. This guide shows you how to use ssh-audit to scan vulnerabilities and secure your SSH Server in just 5 minutes.

Network

Port Knocking: How to Hide SSH Ports and Make Your Linux Server Invisible to Botnets

By IT From Zero April 18, 2026

Port Knocking is a security technique that completely hides SSH ports from port scanners. Learn how to install knockd on Linux to protect your server from brute-force attacks.

Security

Hardening Linux Server: A Comprehensive Security Checklist for Beginners

By IT From Zero March 20, 2026

In the digital age, Linux server security is vital. This article offers a comprehensive hardening checklist covering essential steps – from system updates, SSH configuration, to firewalls and user management – helping you protect your server from all online threats.