Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

Created by the School of Mathematical Sciences @UniSouthampton. Find at https://t.co/OSTFn3Sqpu cipherchallenge.org Southampton, England Joined October 2008

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

4 days ago

Holding a Clubs/Societies/Enrichment Fair for your school or college? The National Cipher Challenge might be just what you need. Here is a poster you can use to promote it! The site will open for registration on Sept 18th and the competition starts Oct 9th. Challenges weekly!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

3 weeks ago

To all in the cipherchallenge.org community getting your results today or supporting those who are: we wish you well, whatever your next steps. Embrace every challenge as an opportunity and welcome every opportunity presented to you.

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

4 weeks ago

Want something to read on these idle summer days? You could take a look at this short article by one of our cipher challenge competitors: mathsrant.com/2025/07/28/the… (Not that the Elves at CC HQ are idle. Far from it - too much to be done in prep for the new adventure. More soon!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

8 months ago

Just a heads up that now the challenge is finished we are working on the leaderboards, prizes and invitations to the National Cipher Challenge event @bletchleypark. Please do keep an eye out for messages from us on the site, and log in regularly to see if we have left one for you

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

8 months ago

Last few days of this year's National Cipher Challenge, and we can't believe it has gone so fast! If you got stuck on Challenge 10B, then we are publishing a guide to breaking it, in the run up to the deadline, so head over to see what you can do! cipherchallenge.org

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

9 months ago

Great book by a brilliant author, who also happens to be guest speaker at this year's National Cipher Challenge prize giving at Bletchley Park! Thanks for agreeing to join us Alex, we are really looking forward to it.

Alex Bellos @alexbellos

9 months ago

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

10 months ago

Over 8,000 signed up ready to take part in the competition at cipherchallenge.org this year! The first competition challenge runs until next Wednesday, so it is not too late to join in. Hope to see you there!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

We have over 8,000 subscribers for the first time ever, all beavering away at cipherchallenge.org & putting a LOT of pressure on the marking system. If you get errors submitting, then it may be worth waiting. It won't affect your marks and will give the chips a chance to cool

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

Tantalisingly close to 8,000 users registered at cipherchallenge.org with just over 24 hours to go til we publish the final practice challenge. Competition challenges start on November 7th, so if you want to join the fun head over to cipherchallenge.org and sign up!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

Half way through Challenge 2 in the National Cipher Challenge and we already have over 7,800 participants. It's possible we'll break 8000. Challenges 1-3 are for practice and we usually get a bunch more signing up at round 4. Head over to cipherchallenge.org to see why!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

Challenge 2 is live and we look forward to seeing what you can do. Still practice rounds, so we're trying to make them accessible to complete newbies. If you have more experience then avoid using the hints we put in place at cipherchallenge.org and see how fast you can do it.

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

Challenge 1 is now complete and the leaderboard will be published at 11 this morning. If you can't wait to see how you did log in at cipherchallenge.org and download your certificates for parts A and B to find out. Don't forget, Challenge 2 goes live at 3pm this afternoon!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

Last day to submit entries to Challenge 1 at cipherchallenge.org. If you don't make the deadline 11pm tonight the next round goes live tomorrow at 3pm. If you miss that there's still time to register & compete in other rounds, with prizes based on your scores in rounds 4-10.

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

A couple of days left to tackle the first practice challenge at cipherchallenge.org, but even if you can't join us yet there is plenty of time to get ready for the main competition challenges starting on Nov 7th. All are welcome!

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Cipher_Challenge (cipher-challenge on Bluesky) @Cipher_Master

11 months ago

At the end of round 1 last year we had 5800 competitors signed up. Here we are on day two with over 6500 already taking part in the competition at cipherchallenge.org. If you want to see why, head over and take a look. There's still time to join in!