Making the Enigma ciphers for the film "Enigma"
Codes and Ciphers
| previous page | next page | index page |
Break SHARK!!!!..Working out the "cribs".
The intercepts give the time of origin of
the U-Boat contact signal.
Our Navy is reporting the position of the
convoys to Bletchley Park.
A radio direction fix on the U-Boat signal
determines which convoy has been sighted.
Use the German grid map of
the North Atlantic to get
the German co-ordinates
reference for the convoy.
Look up in the captured German Short Signal Book the code letters for,
Sighted Convoy, Grid ref 1, Grid ref 2, Convoy Direction, Convoy Speed.
Ignore the last two letters which are the unknown U-Boat reference.
At the first sighting, position is BD1491, direction 70 degrees, speed 10 knots.
This gives as the crib for the first signal:
CKSA KAFV MWZJ QKDX QRZA ??
SC28/04/43 0940 7369 A348
LQB 0910/28/04/43 QGMI VVEE SERQ YGBW IAHK HW.......BHB
..................CKSA KAFV MWZJ QKDX QRZA ??
In a similar way, cribs are worked out for each of the intercepted
| previous page |
next page | index page |
|This page was originally created by the late Tony Sale
the original curator of the Bletchley Park Museum