Writeups from Capture the Flag (CTF) events I participated in. About web, scripting, crypto, reversing and everything in between. All writeups include detailed explanations of how everything works.

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Wizer CTF May 2024

Complete 6 web challenges with source code in 6 hours. I ended up winning this CTF and finding an unintended solution in one of the challenges.

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GCC CTF

An event organized by a French CTF team with many challenges in ranging various difficulties. We placed 11th in the end and most notably found a few different unintended solutions to solve challenges quicker.

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HTB University CTF 2023

The yearly HackTheBox University CTF 2023: Brains & Bytes was an event for many universities worldwide, in which we as "Hanzehogeschool" placed 19th! Cool web challenges and standard categories, with their signature Fullpwn machines

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Cyber Apocalypse 2023

Cyber Apocalypse 2023: The Cursed Mission by HackTheBox. A CTF full of unique and interesting challenges of the utmost quality

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TU Delft CTF 2022

A beginner-friendly CTF organized by the Dutch TU Delft CTF team where anyone could participate, and me and some friends got 3rd place

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Hacky Holidays Unlock the City 2022

An almost 3 week long CTF with beginner to hard challenges. Very high quality challenges with every week a new batch of challenges to try.

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Challenge the Cyber 2022

A Dutch CTF event with a Training Mission to practice, and a real CTF after. Part of the European Cyber Security Challenge. The challenges were all high quality and good learning material

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NahamCon CTF 2022

A yearly Capture The Flag event that was a part of NahamCon. The event lasted 48 hours, and had loads of challenges from different categories.

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Cyber Santa is Coming to Town 2021

A 5-day long CTF, with a challenge of every category coming out every day. Challenges range from beginner to medium.

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Google Beginners Quest 2021

A CTF hosted by Google, with some beginner/medium challenges

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Cyber Apocalypse 2021

22 April is International Earth Day and guess what… The Earth was hacked by malicious extraterrestrials. Their ultimate plan is to seize control of our planet. It's only you who can save us from this terrible fate.

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Other

Miscellaneous one-off CTF writeups