CTU Bonus Assignment

The bonus assignment is an optional assignment available during the winter break. Students who pass the bonus assignment can choose to skip the final exam. Not passing the bonus assignment does not reduce the amount of available exam attempts.

Platform and Structure

• Use the same CTFd instance as the course.
• The bonus assignment has 8 stages.
• Solving a stage unlocks the next stage(s).
• Each stage awards points.
• Bonus challenges are marked “Bonus” in CTFd.
• This assignment must be solved individually (no collaboration).

Evaluation and Grading

• Evaluation is semi-automatic.
• You will receive immediate feedback in CTFd after flag submission.
• Teachers perform the final grading check of your report.
• Teachers have the final say on the grade after reviewing your written report.

Report Requirements (Mandatory)

To pass the bonus assignment, you must submit a report in Google Docs.

• Write one single Google Document for the entire bonus assignment.
• Your report must include evidence of work, such as:
  • commands you ran
  • screenshots and outputs
  • failed attempts
  • Use of AI should be reported and explained
• Your report must show your approach and reasoning.
• Other formats (docx, markdown, PDF) will not be accepted.

📌 The Google document name MUST follow this format:
2025 BSY Bonus Assignment - ctuusername

Sharing the Report (Mandatory)

You must share your Google Doc with all of the following accounts as editors:

Submission Rules

• You may share the Google Doc with teachers while you work on it.
• Your report is officially submitted only when submitted in CTFd.
• After submission:
  • you must not edit the document
  • you cannot fix mistakes after receiving feedback
  • you must not resolve comments on the document

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FAQ – Bonus Assignment

If you have a question not listed here, you can email the teachers at 13136-bsy@fel.cvut.cz or ask in Matrix.

❓ How do I submit the report in CTFd?

You must submit your report by pasting the Google Docs link into the designated Bonus submission field in CTFd. Sharing the document alone is not considered a submission.

❓ When is my submission considered final?

Your submission is final only after:

1. The Google Doc is shared with all required teachers, and
2. The Google Docs link is submitted in CTFd.

After submission, no edits, fixes, or comment resolutions are allowed.

❓ What happens if I forget to share with one account?

If any of the required teacher accounts do not have editor access, the submission will not be graded. Teachers will not manually fix sharing permissions.

❓ Does an accepted flag in CTFd guarantee points?

No. Flags are checked automatically, but points are awarded only after manual review of your report. If your steps are missing, unclear, or not reproducible, you may receive fewer points or 0 points.

❓ How detailed does the report need to be?

Your report must contain enough detail so that another person could reproduce your solution using only your report. Include commands, outputs, screenshots, and failed attempts. If there is no evidence, it will be treated as no work.

❓ Can I use AI tools (ChatGPT, Copilot)?

Yes, but AI usage must be clearly reported and explained in your report. Using AI does not automatically reduce points, but undisclosed AI usage may.

❓ What if I score fewer than 70 points?

If you do not reach 70 points, you must take the regular exam.

❓ Can I collaborate with other students?

No. This is an individual assignment. Evidence of collaboration may result in 0 points.

❓ What timezone is the deadline in?

All deadlines are in CET (Prague time).