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 how we solved different cybersecurity challenges. You can always check our world ranking here.

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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 year! The challenges were released on November 27th and by the evening November 28th we managed to be the first team to solve all of them. It did not go down …

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If you want to join Kalmarunionen you simply need to write us a short e-mail asking for membership. You can send it to member@kalmarunionen.dk. Be patient though, it might take us a little while before granting access. You can also ask an existing member of Kalmarunionen to start the onboarding process, but only in …

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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 team of only a few players - the team is very vulnerable in case a single or two members decides to leave. With Kalmarunionen we intend on being a bigger team …

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