Making the Enigma ciphers for the film "Enigma"
Codes and Ciphers
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Break SHARK!!!!..Setting Depths
Setting the intercepted messages in depth.
With hindsight we can pick the largest group of signals with the
same first letter , "B". The code breakers would have to start each group
not knowing which one would come out best.
BHB.....QGMI VVEE SERQ YGBW IAHK HW
BPZ.....TSVB PZHM CZVM AGUF CZVE AP
BRF.....HTBY GZWV WYKI SFUW RCLY LG
BZR.....NGYB VZRP NTTH WCFM PECF LP
BFQ.....XBFU LVES BJVN MFNP OLRC IB
BDG.....UDIF XIUB FZLR EGFS LFKZ QU
And here they are set in depth.
Along the top of the squared paper are consecutive alphabets in lower case.
Above these are marked the Enigma wheel turnover positions.
Then the intercepted messages with cribs underneath, are written out
offset by the third letter in the message setting.
Now the codebreaker looks for and rings, vertical pairs of the same letter
pairs preferable in the same vertical area on each message and preferably
between wheel turnover positions.
(Because the Enigma machine is symetrical, A enciphers as R
is the same as R enciphers as A)
The short horizontal lines show the parts of the crib which have the greatest
confidence of being correct.
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|This page was originally created by the late Tony Sale
the original curator of the Bletchley Park Museum