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The National Cipher Challenge

Get in touch!

There are a lot of ways to keep in touch with Harry, Jodie and the gang. You can email us at [email protected], post messages on the forum, or let us know about an issue using our bug reporter. TO keep right up to date it is probably best to follow us on social media. You can find us at Twitter, or, increasingly, on Bluesky. If you hang out there, do follow so we can let you know what is happening. You never know, we might even follow back!

We love to hear what you are all up to, so if you would like to share your passion for codebreaking, do send us a message, an image, or tag us in on social media so we can share the joy!

All the best, Harry and Jodie

A year ago, I wasn’t a fan of codebreaking; I wasn’t even good at it, and yet, I ended up spending my 2021 Christmas and New Year deciphering Mission 10A from the 20th National Cipher Challenge. Registering in late December and not having much experience, this was the only mission I could attempt, and I wasn’t going to let it go. 

But why did I do it? Why would I spend my holiday staring at 2500+ characters of incomprehensible and non-sensical English alphabets? And the answer…

There’s certainly an enriching aspect about participating in the Cipher Challenge. For me, it was the phenomenal feeling of finding a crib after spending hours on end computing large numbers to calculate a key length; it was that sensation of satisfaction and achievement after seeing the cipher text on my screen transform into readable plaintext. I started Mission 10A in my bedroom in India, continued to work through it on my return flight to England, and almost a day before the challenge deadline, managed to decipher it! I had come incredibly close to giving up, but through resilience and persistence, managed to crack it eventually! It will remain one of the most cherished moments of my life. 

I’m very grateful to those in the Forums who provided hints and clues (and Harry of course!); to my teacher’s friend who suggested I register for this challenge, and I’m looking forward to this year’s missions by working alongside my team!”

Captain of CTRL+ALT+ELITE

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