Reverse Engineering, simplified

Reverse engineering is understanding how a program works without having its source code, by reading its compiled image or tracing its behaviour while it runs. In CTF challenges you are given a small program that asks for a word or a key, and you must understand the checking logic inside it to reach the correct input. This lesson builds on the Linux and command-line basics and presents the idea simply: how to begin, the first tools, and how to read the logic without drowning in detail. Every program in our labs is harmless: it reads an input and prints a result only.