Making the Enigma ciphers for the film "Enigma" by Tony Sale Page 3

Tony Sale's Codes and Ciphers

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Getting back into "Shark".

The story of the film revolves around Bletchley Park being unable to
decipher the U-boat signals because the German Navy had changed the
Short Weather Signal Book which the codebreakers had been using for
"cribs" . This blackout occurred just as three large convoys were
proceeding from America to the UK. It was imperative to find out
where the U-boats were so that the convoys could be diverted away
from the U-boats.

In the film, Bletchley Park code-breakers had no idea how to restart
breaking the Naval Enigma cipher, called Shark. So they turned to
Tom Jericho who had been the person who broke it in the first place.

Jericho who had suffered a nervous breakdown and had been sent back
to Cambridge from Bletchley Park was brought back to the Park.

In the film Jericho realised that the short signals from U-boats when
they sighted a convoy could be used to discover the Enigma settings
and thus get back into breaking the Naval Enigma cipher, Shark.