THIS PROBABLY DOES NOT APPLY TO YOU, BUT JUST IN CASE: If you are using a drupal username from another site to log onto this one you need to know that you can't use that account to enter the competition. We use our registration database to process submissions and it contains information that other drupal sites won't have asked you for. All this means is that if you want to enter the competition and have not registered with us (as opposed to just browsing the site) you will need to log out and register for a new account on the enlist page.

Welcome to the Cipher Challenge site. If you are a teacher or parent and would like to register for an account to monitor the competition as opposed to taking part please feel free to do so. We have modified the registration form to include a check box labelled "I am a teacher or parent". If you tick this we will know not to enter you as a team in the competition. If you have already registered you can edit your registration details to include the information. It would help us with administration if you could find the time to do this. Thanks, Harry

We are delighted to announce that veteran Cipher Challenge competitor Dave has joined us as editor. Dave and others will be helping us with the site over the summer. Thanks to him for his efforts, and to others who will be joining us shortly.

From the Guardian today: "To most people, getting emotional about mathematics makes about as much sense as being moved by a tax return. But to Justin Mullins, equations can contain a profound personal beauty. An exhibition of his "mathematical photography" opens in London today." Read more