The lessons

Each lesson is free to read in full. Create a free account to run its commands in a live lab and to sit its quizzes and tasks.

Worked in a real lab

Every lesson of this module is worked in a lab started for you alone. The labs it uses:

Teaching a class? Set this module for your students with a teacher guide, marked assignments and a lab for every student.

Security fundamentals: Learn security fundamentals hands on: threats, risk, authentication, access control and layered defence, worked in a real Linux lab.
Applied cryptography: Learn applied cryptography hands on: hashes and checksums, encryption, public keys, signatures, certificates and safe password storage.
Network security: Learn network security hands on: attack surface, firewall rules, segmentation, TLS, SSH and VPNs, and spotting attacks, in real labs.
Web and application security: Learn web and application security hands on: SQL injection, XSS, broken access control, weak sessions, secrets and hardening.