The Alan Turing Cryptography Competition

2026 edition. From the people behind the MathsBombe Competition.
Home Archive
The Chapters
Chapter 3
Released Mon 26th Jan 4:00PM
Chapter 4
Released Mon 9th Feb 4:00PM
Chapter 5
Released Mon 2nd Mar 4:00PM
Chapter 6
Released Mon 9th Mar 4:00PM
Solutions
Released Mon 30th Mar 4:00 PM

Chapter 2

Ellie: The pattern in that last one wasn't too hard to spot, but can you work this one out?
Fewer words, more symbols!

The image above contains a hidden question. Please enter the answer to the question in the box below. If the answer is a number please enter it using numerals (to two decimal places) rather than words.

To deter guessing without thinking, we ask that you also solve the following simple arithmetic problem before checking your answer:

If x = 6, y = 3 and z = 9, what is x × y + z?  

This problem was first solved on Mon 19th January at 4:38:18pm
Alan Turing Cryptography Competition 2026 is organised by the The Department of Mathematics at The University of Manchester.
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