Workshop: Capture the flag

Workshop: Capture the flag

Capture The Flag or CTF challenges are IT-security puzzles and competitions to practice (and show off) your hacking skills. The exact format can vary but the goal is always to collect one or more flags. You can compete alone or in teams, online or IRL. It’s all about problem solving within the IT-security realm and typical challenges include:

  • Web and network penetration
  • Reverse-engineering binary data and programs
  • Finding weaknesses in cryptography
  • Performing forensic investigations
  • Attack/Defense battles


Weather you attended our CTF introduction talk or not, it’s time to get our hands dirty! In this workshop you will get the chance to try out and hopefully complete your first CTF challenge. The experienced CTF-veteran Zeta Two will present a couple of challenges, point you to tools to use and hang around to help you out when you get stuck.


Carl “Zeta Two” Svensson is a security professional and hobbyist currently working as the head of security at Swedish healthcare startup, Kry. He is a frequent CTF player for the Swedish top team HackingForSoju, organizer of Midnight Sun CTF and an active member of the Swedish and international security community with a great fondness for a broad range of topics, reverse engineering being one of his favorites.

Feel free to reach out to Carl on and visit his website.

Materials provided

  • WiFi
  • Beer and snacks

What to bring/prepare

  • A laptop running Linux (natively or in a VM)
  • Install necessary tools (see below)

How to install VirtualBox and Ubuntu Linux on Windows 10

Furthermore you need to have installed the following programs: Wireshark, Firefox, GDB, Python (with PIP), Curl and pwntools.

On Ubuntu you can install these tools by running the following two commands in a terminal:

sudo apt-get install wireshark gimp firefox gdb python python-pip curl

sudo -H pip install pwntools

Reach out if you’re having problems with the setup/installation or just show up early to let us help you.


17.30-18.00 Pre-event mingle
18.00-18.30 Introduction to the challenges and tools 
18.30-20.30 Let's hack!
20.30-21.00 Mingle & chill

Code of Conduct

Please read our Code of Conduct before attending the event.

When and where

When: April 24th, 2019, 17.30 (door closes at 18.00)

Where: Regeringsg. 30, Stockholm. Follow the 0xFF-signs, 4th floor, “Convendum”. OpenStreetMap


The event is free of charge but the number of seats are limited.

We have reached the maximum number of attendees and the registration has closed.