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He was a brilliant young mathematician called Alan Turing.

The amazing thing about Enigma was that it was always changing.

In one message, the letter ‘e’ could be ‘f’, but in another message it could be ‘z’.

When Hitler attacked in 1939, the Poles told the British everything that they knew about the code.

Most of the British code-breakers thought that Enigma was unbreakable.

His great achievements in code-breaking and computing happened in his twenties and thirties.