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Chiffriermaschinen, Aktiengeseelschaft, Berlin W
35, Stelitzer Str. 2. Fernspr.:
Nollendorf 2899, Te. Adr. : Chiffrier
Berlin. 1925.
THE CIPHER MACHINE ENIGMA
INSTRUCTIONS FOR USE
1. KEY ADJUSTEMENT
a) Operating the lid and taking out the
cylinders.
Put the switch-handle 5 (I & II) parallel
to the right edge. Unscrew bothlid-screws
12 (I) open the lid. Put the lever 9 (II) in a vertical position., push the
reversing
cylinder 11 (II) to the left, to stop, press together the three right cylinders
(rollers)
by the notched wheels, move then upwards, and pull them from the shaft, in
order to
be able to adjust the machine to the key agreed upon, the following
manipulations
are necessary.
b) Selection of the cylinders and order of same.
From the existing ciphering cylinders take out
those three which are required by the
agreed upon. Slide them on to the shaft in the stipulated order (collar of
shaft to the
left, letter-ring on left side of cylinder). Then put the cylinders in and
shift the lever
9 (II) to the rear as far as stop,
c) Adjustement of the rings upon the cylinders.
Removing the spring 7 (II) turn the letter-ring
of each cylinder so far that the join of
the rings upon the spring catches the hole beyond the letter which has been
agreed
upon the cylinders.
d) Outside adjustement of the letters in the
windows.
The lid and turn the notched wheels till the
letters agreed upon become visible in the
windows.
e) Combination of the key
Let us take, for instance, the key (always
start from left hand) : II, III, I, G,X, M,Z;
I,S,A,N.
1. The group II, III, I is to design the order
of the cylinder, and means to say that the
ciphering cylinders 4 (I & II) which bear these marks on the frontal side
of the
movable contacts have been put on the shaft in this order (counting from collar
of
shaft). If there are more than three cylinders, the roman figures mean at the
same
time the cylinders to be selected.
2. The group G, X, M, Z means to say that the
pin of the spring 7 (II) catches
beneath the holes below these letters of the letter-rings.
3. The group I, S, A, N means to say that these
letters become visible in the windows
3 (I).
f) In round numbers 2.7 million of different
and useful keys possible.
If possible, change the key so often that no more
than 30 typewritten pages may be
written with the same key. As nearly 3
millions of keys are given, this can easily be
done and only depends on organization. Adding the possible change of
letter-rings,
possible you will obtain about 1000 milliards of possible keys.
g) Transmitting the key and keeping it secret.
If need be, the keys may be divided, and each
part entrusted to another person.
II. CIPHERING
The switch-handle 5 (II & III) has to be
set to "maximum" (hell). When the letters
flash up to dimly, set it to "minimum" (dkl.) It is advisable to
employ sqare paper to
writing. The text is ciphered, letter by letter, by pressing down the keys I (I
& II) as
it is done when type-writers are being used. Each key must be sufficiently
pressed
down to make a lamp 2 (I & II) flash up. If intervals between the words
ared desired,
for instance, the key "X" may be pressed down after each word.
Example :
Original Text :
….
Cipered Text
DOMRN YJLRK GKIQS QXWCP LDKAJ FTJUT EXUFL
OJCSC KNGRO XPJZY SHP
If figures are to be written, the first ten
letters may, for instance, be employed
instead of same in pressing down, in the same time, the "Y". When
passing from
figures to letters, press the key "Y" once more. In short :
insert "X" before letters,
"Y" before figures and other signs.
III. DECIPHERING
Every machine is available for deciphering as
well as ciphering. Adjust the machine
to the stipulated key, connect the current by turning the switch-handle 5 (I
& III),
and copy the ciphered document letter by letter, by pressing down the
corresponding
keys. The the flashing letter will show the original text.
Examples :
Ciphered Text :
DOMRN YJLRK GKIQS
QXWCP LDKAJ FTJUT EXUFL
OJCSC KNGRO XPJZY SHP
Deciphered Text :
...
IV. CLERICAL ERRORS
Having pressed down, by mistake, a wrong key,
put back, by two steps, the
ciphering cylinder on the right side. Try the last correct letter once again,
then, in
order to see whether one of the other cylinders has moved together with the
right one.
Having written but a few letters, you may, in
order to repeat the twenty-third letter,
for instance, press down any key you please twenty-two times, and then repeat
the
desired letter.
V. THE MACHINE TESTED IN PRACTICE
Being the result of many years’ labor, our machine
has been the object of count-less
trials and experiments under most unfavorable circumstances. If you treat the
machine carefully, interruptions can scarcely take place, and, when occuring,
easy to
remove (see particular directions to be delivered with each machine).
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