Here's your chance to crack ciphers similar to those Bletchley Park's codebreakers faced during World War II. Below, we present three ciphers of different levels of difficulty, from easiest to ...

This was one of the most secure hand ciphers used in the Second World War. It was used by both the Allies and the Axis, and served both well. Its main weakness was that if the attacker intercepted ...

You could start by making A = 1, B = 2 and C = 3, but once you've practised a little bit, try coming up with your own equation for the cipher, which will make it more tricky to solve. For example ...