Chapter 4

You'll have to get your paper out for this one and no sitting on the fence with the answer to the question? Have you seen any trains on the rails recently?

Above is the image attached to Mike's message. When decoded, it is a question. You must find the answer and type it into the box below.

Alan Turing Cryptography Competition 2021 is organised by the The Department of Mathematics at The University of Manchester.
© The University of Manchester 2012–2021, All Rights Reserved
Contact us | Privacy notice