January 2006
Intermediate to advanced
55 pages
1h 11m
English
Content preview from Solving the Enigma: History of Cryptanalytic BombeBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix I. Cribs, Menus, and Bombe Set-Up
In order to set up the U.S. Navy Bombe, cryptanalysts first had to determine a "crib." A crib is the unenciphered text that is assumed, or known, to appear in the message.
Cribs could come through a variety of methods. Some of the best cribs came from errors made by the Germans themselves. On more than one occasion, a German signal clerk sent the same message twice in two different codes. If the code for one was known, it provided a crib for the unknown system.
Another frequent German mistake came in standardized messages. For example, a shore weather station in the Bay of Biscay sent out a message every day at 7:00 A.M. which began, "The weather in the Bay of Biscay will be...."[50] Knowing the exact ...
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