You have an idea for an interesting cipher or crypto challenge? We would be happy if you submit it to MysteryTwister.

Please include the following:

• Submit your files as a single .zip archive.
• Create a Markdown file containing the challenge.
• If dynamic verification is needed, provide a Python script that validates a candidate solution.
• Take inspiration from recently published challenges for style and structure.
• Provide the correct solution and a short explanation so we can verify solvability.
• Suggest a short teaser/description and an approximate level (difficulty category).

For any questions or to submit your material, contact: mtc3@cryptool.org