The protective tools Linux and the command line for defenders, cryptography with a live SHA-256 demo, web application security with the OWASP Top 10, and system and network security: hardening, segmentation and zero trust.
Lessons 0 Overview Linux and the command line for defenders, cryptography with a live SHA-256 demo, web application security with the OWASP Top 10, and system and network security: hardening, segmentation and zero trust. 1 Linux and the command line for defenders Most servers and security tools run on Linux, and an analyst who cannot read a log in the terminal always depends on someone else. You learn files, permissions and users, where logs such as auth.log live, the commands that search, count and sort, processes and open ports, and then build a "pipeline" that answers a security question from a real log. 2 Cryptography: how secrets stay secret Three tools explain most of what you will see: symmetric and asymmetric encryption and hashing, then digital signatures, TLS and post-quantum cryptography. With a live demo of how the whole SHA-256 fingerprint changes when you change one character. 3 Web application security: the OWASP Top 10:2025 The ten most serious risk categories in web apps, with examples a non-technical reader can follow: a page that shows someone else's invoice, SQL injection you try and fix yourself in running code, settings left on defaults, and compromised libraries. 4 Systems and network security: hardening, segmentation and Zero Trust How to shrink what an attacker can touch, and stop them moving if they get in: patching and vulnerability management, hardening, segmentation, Zero Trust, EDR, 3-2-1 backups and shared responsibility in the cloud. 5 Wrap-up and resources The takeaways and glossary of this track.