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The National Cipher Challenge

Challenges

Challenge Start End
Introduction 11/09/2025 - 09:00
Chapter 1 (practice) 09/10/2025 - 15:00 15/10/2025 - 23:00
Chapter 2 (practice) 16/10/2025 - 15:00 22/10/2025 - 23:00
Chapter 3 (practice) 23/10/2025 - 15:00 05/11/2025 - 23:00
Chapter 4 06/11/2025 - 15:00 12/11/2025 - 23:00
Chapter 5 13/11/2025 - 15:00 19/11/2025 - 23:00
Chapter 6 20/11/2025 - 15:00 26/11/2025 - 23:00
Chapter 7 27/11/2025 - 15:00 03/12/2025 - 23:00
Chapter 8 04/12/2025 - 15:00 10/12/2025 - 23:00
Chapter 9 11/12/2025 - 15:00 17/12/2025 - 23:00
Chapter 10 18/12/2025 - 15:00 11/01/2026 - 23:00
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