Crate-CTF Challenge Repository

Welcome to the Crate-CTF challenge repository! This repository contains past Capture-The-Flag (CTF) challenges used in Crate-CTF, an annual cybersecurity competition organized by the Swedish Defense Research Agency (FOI).

Crate-CTF typically runs for 8 hours on an autumn Saturday. Participants solve a variety of challenges related to e.g. cryptography, reverse-engineering, or forensics. The competition aims to be both fun and to encourage learning.

For more information about Crate-CTF, visit the FOI website.

Table of Contents

• About the Challenges
• Repository Structure
• Previous Competitions and Winners
• Contact
• License

About the Challenges

Each challenge in this repository was previously featured in the Crate-CTF competition. They are placed in one of the following categories:

• Cryptography
• Reverse engineering
• Web application security
• Forensics
• Exploit development
• Open Source Intelligence
• Miscellaneous (i.e. anything not fitting the above)

These challenges are provided for educational and practice purposes. It should be noted that the challenges are normally written in the swedish language.

Repository Structure

The repository is organized by year. For each year the challenges are sorted into categories. The structure typically looks like this:

.
├── 2024
│   ├── README.md
│   ├── facit.md
│   ├── crypto
│   │   ├── CryptoChall_1
│   │   │   ├── challenge.yml
│   │   │   ├── README.md
│   │   │   ├── solve.py
│   │   │   ├── docker
│   ├── web
│   ├── ...
├─ 2023/
│  ├─ ...
└─ ...

• Year directories: Contain challenges for that particular year.
• facit.md: Contain a short solution text (in swedish) for each challenge.
• Category directories: Group challenges by topic, such as crypto, reverse, web, etc.
• README.md: Each challenge directory ideally includes a README detailing the challenge as well as a solution description.

Previous Competitions and Winners

2024

1. RoyalRoppers
2. KebabEngineers
3. 5ca5dd

Alongside the competition was also an 8-hour long live-stream, featuring tutorials on previous challenges, a talk on OSINT, dial-in remote C64-gaming and much more. It can be found on YouTube.

2023

1. KebabEngineers
2. 5ca5dd
3. RoyalRoppers

2022

1. RoyalRoppers
2. watevr
3. 5ca5dd

2021

1. watevr
2. KTHCTF0x1
3. 5ca5dd

2020

1. watevr
2. LionHack
3. KTHCTF0x1

Contact

For questions, feedback, or general inquiries, please contact us at [email protected].
We have a Discord server, though it’s quieter outside competition periods. Crate-CTF can also be found on CTFtime.

License

The content in this repository is released under the MIT License unless otherwise stated. Please see the LICENSE file for details.