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cipher-challenge.bsky.social
Harry
@cipher-challenge.bsky.social
Join Harry at the National Cipher Challenge, which invites school-aged participants to put their code-breaking skills to the test every Autumn. Created by the School of Mathematical Sciences @UniSouthampton.
We couldn't be happier with the response to the first cipher challenge this year. Over 7400 signed up already and we're still on the 1st practice challenge! Head over to www.cipherchallenge.org/ to to get your students signed up in time for the 2nd practice challenge tomorrow.
October 15, 2025 at 8:05 PM
The 24th National Cipher Challenge is now open for registrations and we have already had 1200 sign ups. The competition starts on October 9th, so there is time to register your teams and get them investigating codes and ciphers. Catch up on our news at www.cipherchallenge.org.
September 22, 2025 at 10:44 AM
Day 1 and we have reached our first 500 registrations at www.cipherchallenge.org already! Will we beat last year's record 9,000? That is up to you!
September 18, 2025 at 6:10 PM
Ready to register for the National Cipher Challenge? The site opens tomorrow. Did you know that as a teacher you can monitor the teams at your school? You will be able to read more about that at www.cipherchallenge.org/how-to-bulk-...
September 17, 2025 at 8:16 AM
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 throughout term!
September 2, 2025 at 11:37 AM
Yes it is! Posters are stacked ready to go out, and the website is being updated. We really hope you like it!
August 26, 2025 at 11:44 AM
The team at www.cipherchallenge.org love exponentials!
October 11, 2024 at 8:36 AM
It's a living breathing thing: www.cipherchallenge.org
October 10, 2024 at 1:53 PM
While the majority of the cipherchallenge.org competitors come from the UK we have a number from UK schools overseas and even some who take part "just for fun" from around the globe. We thought you might like to see where they are, so courtesy of Google Analytics, here is a map:
October 10, 2024 at 10:04 AM
Looks like the site has woken up! www.cipherchallenge.org is the new place to hang out (if you like breaking ciphers that is!)
September 13, 2024 at 1:24 PM
Anxiously waiting for your cipherchallenge.org poster? They are all bundled up ready to go! If you use it on a display, do post a picture, we love to see them. (Thanks to our friends at Document Despatch for all their hard work on the mailing.)
August 28, 2024 at 12:35 PM
Wondering what and what not to do if you get an A4 envelope in the post that looks like the attached? Some advice
1) Don't sigh/complain about the growth in junk mail
2) Admire the typography
3) Open the envelope & take out the poster inside
4) Find a spot to put it up where your pupils will see it
August 21, 2024 at 2:05 PM
For those new to the National Cipher Challenge a primer
What: an online codebreaking competition for UK schools, 6th form colleges & home schooled students.
When? 12/09/24 - 06/01/25
Where? www.cipherchallenge.org
Why? An enrichment activity aimed at stretching pupils, whatever their ability. (1/7)
August 20, 2024 at 10:58 AM
Thanks Mark, hope they enjoy it just as much this year. Maybe a few of them will even win medals.
August 19, 2024 at 12:36 PM
As a thank you to our early followers, and an inducement to the rest, here is an early glimpse at the poster for this years #cipherchallenge, The Mystery of the Silver Bullet.
August 19, 2024 at 11:44 AM