$ ctf42

CrateCTF 2025

official repo

Crate-CTF is an annual Capture The Flag (CTF) competition organised by the Swedish Defence Research Agency in collaboration with the Swedish Armed Forces, designed to introduce high school and university students to the field of cybersecurity. After having over 1000 participants last year we return for our sixth CTF, with challenges for all skill levels from beginners to seasoned CTF players. The challenges are categorised into web exploitation, reverse engineering, binary exploitation, cryptography, forensics, OSINT, networking and the all-encompassing "other".

While the event will be conducted in Swedish, international participants are also welcome to join (using translation tools as needed). Communication with challenge authors and administrators can be conducted in English.

Web 1

Challenge Has
Articular files

Pwn 7

Challenge Has
Armsdealer files
Can_you_really_change files
ClosedBSD files
Date_service files
Heapie_2 files
Riscy_Business_2 files
Sandbox files

Reverse 3

Challenge Has
Denial_Of_Service files
Eventually_a_Flag files
WASabiMacken files

Crypto 3

Challenge Has
Fiats_and_Shamirs_Sign_Forge files
Julius_Caesar files
collision files

Forensics 3

Challenge Has
Event files
Forward files
Short_routes files

Misc 4

Challenge Has
Deserialization files
Echo_Service files
Out_of_Sight files
SecretKey files