The Alan Turing Cryptography Competition

From the people behind the MathsBombe Competition.
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Chapter 5

Mike,

I think I needed more training for that last one. Here is something to get you pondering. Although you may think that I'm not playing fair, it's easy if you know the key,

Have fun

L

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

This problem was first solved on Mon 22nd February at 4:21:55pm
Alan Turing Cryptography Competition 2021 is organised by the The Department of Mathematics at The University of Manchester.
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