Modern Cipher Challenge 2026 is a small, student-run educational project hosted via GitHub Pages. We intentionally minimise the data we collect to protect your privacy and adhere to data minimisation principles.
If you choose to create an account to join the leaderboard, we collect and store:
When you submit a solution while logged in, your solution is sent to our server to be validated. If correct, your account's score is updated in the database.
Please note that your chosen Display Name and your cumulative competition score are public and will be visible to anyone visiting the website's leaderboard page.
To help the organiser understand how the challenge is being used, the site increments a few basic, server-side counters. This tracks total counts of page views, submissions, and correct submissions per mission. This system is handled by a completely separate worker and does not log or track personal data, login sessions, IP addresses, or cookies.
We strongly advise you not to use your real name, email address, or any identifiable online handles for your username or display name. Please use a completely anonymous pseudonym.
Your database entries will only be kept for the duration of this challenge. Once the competition concludes (), the Cloudflare D1 database records will be permanently deleted.
If you wish to withdraw from the competition and want your account and score permanently purged from our database immediately, please fill in the data deletion request here: https://dweglowski.github.io/ModernCipherChallenge2026/delete_my_data.html. Your data will be deleted within 72 hours.