The translated 1940 Enigma General Procedure Page 25

Tony Sale's Codes and Ciphers

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M.Dv. 32/1.

25



Indicator Group Letters: N U Z. (transposed: Z N U)

Dummy Letters: U L

Text of Message -- including Indicator group -- consists

of 129 letters.


The message then reads:


1755 - 129 - WEP HFI - ULZNU SGEXU etc. up to 129 letters in all

i.e. 25 five-letter groups and 4 letters.

Note: In sending the message, the heading is given twice. For
example:

1755 1755 - 129 129 - WEP HFI WEP HFI -.




Deciphering.



141. Determine from the letter count (the second number in the

Heading) whether you have received correctly.



142. Cross out the dummy (i.e. first two) letters of the indicator

group (i.e. of the first radio group). Arrange the last three
letters of the indicator group in alphabetical order and determine
from the Cipher Table (Cipher of the Day) which Cipher of the Day
has been used.

Note:


Since the Supreme Command of the Army has not listed the

meanings of all indicator groups in a list comparable to that of
the K-Book's List of Groups, the receiver must look up the indi-
cator group of all available Cipher Tables (Armed Forces' Cipher,
Armed Forces Staff and Authorities Machine and Hand Ciphers)
(Wehrmacht-, Wehrmacht-Stabs- und Behoerden-Maschinen- und -Hand-
schluessel). (This probably adds up to five ciphers, maybe six.

- Tr.)



143. Set in the Cipher of the Day on the Enigma.


144. Take the Grundstellung from the Message Heading (first

letter group) and set it in in the windows of the Enigma reading
from left to right.



145. Key the letters of the enciphered Message Cipher (second

letter group of the Heading) on the Enigma. The result is the
Message Cipher.



146. Set the Message Cipher in the windows of the Enigma reading

from left to right and key the letters of the radio group(s) --
from the second radio group on -- one after the other. The result
is the plain text of the message.




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