add intro to CTF event

Author: exoji2e

_events/2021-11-11-intro-to-ctf.md

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+---
+layout: event_small_title
+title: "Intro to CTF"
+place: "E:1406"
+timerange: "17:15 - 19:00 UTC+1"
+---
+
+What is a Capture The Flag (CTF) competition? Is it the way to become a hacker?
+
+You will find the answers to these questions and more in this lecture by Code@LTH! You will learn some common techniques used in web hacking and cryptography. We will also demo some problems.
+
+Capture the Flag is a security contest where you solve security related problems. Often the goal is to gain access to find a hidden text string, called a flag. Usually solving and finding the flags include exploiting some kind of vulnerability in a system, that could very much have been a real system. By solving these kinds of problems, and participating in CTFs you learn to look for and discover vulnerabilities, basically trying out to be a penetration-tester.