What a weekend: 2nd at GoogleCTF, Mid-Season World #1 - and a visit from the Minister! 🇩🇰🚀 Our team went all in at Google CTF 2025 and crossed the finish line …| www.kalmarunionen.dk
🎯 Triple CTF Weekend in Copenhagen! 🇩🇰💥 This weekend, Kalmarunionen gathered physically for another meetup at Eupry in Copenhagen for an intense and fun-filled …| www.kalmarunionen.dk
Welcome to KalmarCTF 2025! 🎉 Kalmarunionen is back with another electrifying edition of #KalmarCTF! 🎉 Last year was a blast, and we’re dialing it up yet again. …| www.kalmarunionen.dk
🎉 We Did It! 🎉 Kalmarunionen is now officially the #1 competitive hacking team in the world! 🏆 ✨ The Road to #1 It’s been an incredible journey since we started in 2020, climbing our way up the global rankings on CTFtime.org: 2020: 66th place 2021: 15th place 2022: 10th place 2023: 3rd place 2024: 1st place 🚀 So many weekends, late nights, and countless hours of hacking, planning, and fun went into reaching the top. We faced defeats, learned from them, and came back stronger...| Kalmarunionen
We just won the Chaos Communication Congress (38C3) HXP CTF in Hamburg - ending the year in style and securing our qualification for DEF CON Finals 2025! The Chaos Communication Congress (38C3) is the 38th installment of this renowned conference, where 14,000 security enthusiasts gather every year between Christmas and New Year in Hamburg. Kalmarunionen turned up in full force and once again competed against some of the best teams in the world, emerging victorious. This not only caps off a fa...| Kalmarunionen
This weekend, we had our last big meetup in Copenhagen for the year, and it was a blast! 🎉 We had a fantastic time participating in the SECCON CTF, where we secured a top 10 placement. The challenges were engaging, and it was great to see so many new players testing out for the team. There’s a lot of promising young talent emerging in the scene, which bodes well for the future. 🚀 We even had visit from one of the founding members Nicolai Søborg and the first official Kalmar Hacker Ba...| Kalmarunionen
Prioritizing and securing your OT infrastructure isn’t just a good idea—it’s essential for protecting our critical systems. Here’s an example of why: It’s Cybersecurity month, and of course, Kalmarunionen want to showcase our talent! Although Operational Technology Security isn’t always considered the most sexy area, it is crucial for protecting our critical infrastructure and ensuring resilience against cyber attacks in a modern society. Our longtime member Jens Nielsen from ICSR...| Kalmarunionen
🏆 We just won Google’s hacking competition 2024 - Google CTF! 🏆 We are thrilled to announce that we have emerged victorious in the Google CTF, securing the top spot on CTFtime.org Global CTF Ranking, earning $12,345 in prize money from Google, and ensuring our place at the Google Hackceler8 finals in Malaga later this year. This weekend, our team gathered at Truesec Denmark offices in Copenhagen and gave it our all as Kalmarunionen. From placing 47th at Google CTF in 2020, we’ve com...| Kalmarunionen
🚀 Kalmarunionen and Norsecode Aim for DEFCON Glory – Sponsors Needed! 🚀 This weekend, Kalmarunionen collaborates with our Nordic peers at meetup in Copenhagen under the #Norsecode flag to qualify for the prestigious DEFCON finals. To qualify last year we fought right to the end (check out video from the post). 🌟 Stepping Up Our Game in 2024 🌟 This year, we’re even stronger. Positioned as a powerhouse on the international CTF leaderboard, Kalmarunionen, alongside our Nordic par...| Kalmarunionen
🚨 Hackers, get ready! 🚨 🎉 Kalmarunionen is thrilled to bring back our #KalmarCTF challenge! 🎉 Last year was epic, and we’re doing it all over again. Thanks to Hex-Rays, we’ve got those sweet #IDAPro licenses for our #ctf winners.🏆 Whether you’re here to defend your title or to claim a new one, we’re looking for you. Dive into our world of top-tier binary exploitation challenges. It’s not just a contest; it’s a test of skill, speed, and smarts.| Kalmarunionen
🏆 #1 at Real World CTF, 🥇 #1 on CTFtime (Global world ranking 2024) and 💰 $10,000 in winnings after our first meetup. We had a lot of fun playing Real World CTF …| www.kalmarunionen.dk
Kalmarunionen is a non-profit organization. We aim at building a community where people can participate if they have the knowledge and motivation to do so. Our …| www.kalmarunionen.dk
Writeup by: Oliver Lyak (ly4k) Solved by: Zopazz, Oliver Lyak (ly4k) QLaaS QLaaS (Qiling as a Service) was a Clone-and-Pwn challenge with difficulty Schrödinger …| www.kalmarunionen.dk
Introduction We (Kalmarunionen) firstblooded the Leakless Note challenge during the SekaiCTF 2023. Only four teams solved the challenge during the competition. …| www.kalmarunionen.dk
Summary This is a writeup for the “Collisions” challenge by mr96 at m0leCon Teaser 2023. We were the first team to solve this challenge, which had a …| www.kalmarunionen.dk
Summary This is a detailed writeup for the “IFUCKUP” challenge at the DEF CON CTF 2023 Qualifiers that I solved together with several team members …| www.kalmarunionen.dk
Summary This is a writeup for the “Unlimited Braid Works” challenge by mitsu at zer0pts CTF 2023. This challenge involved non-commutative group …| www.kalmarunionen.dk
Summary This is a writeup for the “anti Kerckhoffs” challenge at the Codegate 2023 Preliminaries. This challenge was built around basic abstract …| www.kalmarunionen.dk
Kalmarunionen is a Capture The Flag (CTF) team within cybersecurity. We hack stuff and this is our website. Occasionally we also post writeups and tutorials on …| www.kalmarunionen.dk
Summary This is a writeup for the “babyPQ” challenge by mr96 at m0leCon Teaser 2023. We were the first team to solve this challenge, with a total of …| www.kalmarunionen.dk
Summary This challenge used garbled circuits. They have a cryptographic application, which is however irrelevant for understanding this challenge and solution. …| www.kalmarunionen.dk
Revver, Midnight Sun CTF writeup Solved by: zzz, Zopazz Writeup by: Zopazz Description: Automated reversing is a solved problem, right. Writeup General …| www.kalmarunionen.dk
kgbfskfsb, MidnightSun CTF writeup Writeup by: Nigma, nrabulinski Solved by: sebastianpc, Eldar Zeynalli (Hako), nrabulinski, Nigma Description: DeNiS Sergeev …| www.kalmarunionen.dk
Writeup by: Nicolai Søborg Solved by: Nicolai Søborg, Rasmus Have This year we managed to land a 13 place, again! (which is really a shame as top 12 gets swag …| www.kalmarunionen.dk
Writeup by: Zanderdk | linkedin Solved by: ZZZ | linkedin, N00byedge | linkedin Indie VMM - HXP 2021 In this challenge we are given a root access to a linux …| www.kalmarunionen.dk
Writeup by: andyandpandy Solved by: andyandpandy, Hako Writeup The challenge has a race condition vulnerability, where you can delete your user and rapidly …| www.kalmarunionen.dk
Writeup by: andyandpandy Solved by: andyandpandy, eskildsen, 2by4 Writeup This is most likely an unintended solution. TL;DR: Create a note with two iframes. …| www.kalmarunionen.dk
Writeup author: Bawstaws The Lost Bottle is the most awesome pirate game. It is about a young pirate, that lost her favorite bottle of old rum. She is now …| www.kalmarunionen.dk
Skrevet af: Oliver Nordestgaard og Kim Schulz Er dit CPR nummer på internettet? I forbindelse med at der i disse dage skrives mange artikler om den nye …| www.kalmarunionen.dk
Writeup by: ChrRaz Kuuuurveen We are given the following challenge description. A client and a server have been communicating the flag over an encrypted …| www.kalmarunionen.dk
Writeup by: ChrRaz 80s Commitments When opening http://80s-commitments.hkn we are greeted with the following page: We are given a public key and a …| www.kalmarunionen.dk
Challenge Description (967 points) Play to win and log ’em all! Once you’ve seen all 151 Asciimon, talk to Professor Jack for the flag. We’ve …| www.kalmarunionen.dk
Writeup by: Nicolai Søborg Cr0wnAir TL;DR - bypassing a filter to generate two JWTs (RS256). Finding e and N from the two signatures and forge an arbitrary JWT …| www.kalmarunionen.dk
Writeup by: Zanderdk Introduction On the 2021-01-26 qualy released this article describing a “new” (actually 10 year old) bug in sudo that allows an …| www.kalmarunionen.dk
The Vault The challenge is a simple HTML file with a keypad that allows you to input 4 digit pin. The file loads main.js and calls Module.ccall('validate') to …| www.kalmarunionen.dk
Every year since 2017 the Danish National Cyber Crime Center (NC3) arranges a christmas CTF. 2020 was the first year where Kalmarunionen particpated and what a …| www.kalmarunionen.dk
As a relatively new team based in Denmark, we are currently limiting our recruitment focus to experienced players either based in Denmark, or who otherwise have …| www.kalmarunionen.dk
Kalmarunionen is the result of a lot of CTF teams uniting - primarily Danish. We have done this as it is hard to keep the commitment when being part of a small …| www.kalmarunionen.dk
Writeup by: andyandpandy, Anakin Solved by: Fr3d, c3lphie, Anakin, andyandpandy, patriksletmo, ly4k and more Writeup This challenge took us 21 hours to solve. …| www.kalmarunionen.dk