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When registering you can choose between joining an existing team, setting up a new team or creating an individual entry.

Please enter your Date of Birth so we can check your age, this data will not be stored.

We ask for this to determine how best to process your registration for the challenge - we do not store your age.

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Once registered you can use the Bulk Registration Tool to sign up your teams.

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Cipher_Challenge 1 day ago

We are up to 5831 participants registered for cipherchallenge.org. You still have time to get involved. The deadline for Challenge 4 is 11pm Wednesday, and even if you miss that there will be five more rounds to enjoy. Get on board to help stop the Countdown to Catastrophe!

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