Welcome to the 2025 National Cipher Challenge! Whether you are returning or a first time visitor we look forward to getting to know you over the next few months! It does not cost anything to register or take part, so head over to the registration page to set up an account. If you are a teacher, you can set up a teacher account that will allow you to bulk register and monitor the teams in your school, and you can find instructions here. The competition will start on Oct 9th, so you have a while to get ready, but the sooner you sign up the sooner you can join the conversations on the Forum. If you have any questions, post them there, or email us at [email protected]. We look forward to hearing from you.