Please send the challenge you created (packed within a single .zip file) to the following address: mtc3@cryptool.org

The .zip file should contain the following:

• A challenge description (a text document is sufficient, we take care of the formatting),
• a secret text and the corresponding plaintext,
• a solution (solution phrase) which users can acquire from the revealed plaintext,
• a binary (C/C++) or script (Python, Perl) for automatically verifying solutions (optional),
• a suggestion for the level your challenge should be part of,
• a suggestion for the maximum number of attempts as well as
• the name of the author of the challenge (optional).