# SSH (Secure Shell) Architecture & Security

> Master Linux remote administration. Explore SSH daemon hardening, key management, and how attackers abuse SSH for lateral movement and stealthy pivoting.

Canonical: https://codelivly.com/rooms/ssh-secure-shell-architecture-security
Last updated: 2026-07-04

| | |
|---|---|
| Level | Beginner |
| Category | Cybersecurity |
| Lessons | 3 |
| Estimated time | 30 min |
| XP | 200 |

Dive into the lifeblood of Linux remote access. The SSH (Secure Shell) Architecture & Security module breaks down how the SSH daemon authenticates users, secures connections, and manages cryptographic keys.

You will learn to harden sshd_config, detect unauthorized authorized_keys backdoors, and understand how attackers weaponize SSH tunneling (Local, Remote, and Dynamic port forwarding) for stealthy lateral movement and network pivoting. By the end of this module, you will be able to secure remote access and detect when attackers are using SSH to bypass firewalls.

## Lessons

1. Understanding SSH & Daemon Hardening (30 min)
2. Key Management & Agent Hijacking (30 min)
3. SSH Tunneling & Pivoting (30 min)

## Related

- [Learning path: Linux Fundamentals for Cybersecurity](https://codelivly.com/learning-paths/linux-fundamentals-for-cybersecurity)
- [All rooms](https://codelivly.com/rooms)