<s>
Wahlwort	B-Algorithm
(	O
nonsense	O
word	O
or	O
filler	O
)	O
is	O
a	O
cryptographic	O
term	O
used	O
particularly	O
in	O
connection	O
with	O
the	O
Wehrmacht	O
,	O
which	O
used	O
wahlworts	B-Algorithm
on	O
their	O
Enigma	O
rotor	O
machine	O
in	O
the	O
encryption	O
of	O
their	O
communication	O
in	O
World	O
War	O
II	O
.	O
</s>
<s>
The	O
wahlwort	B-Algorithm
was	O
intended	O
to	O
hinder	O
the	O
enemy	O
's	O
cryptanalysis	O
and	O
prevent	O
the	O
decryption	O
of	O
the	O
ciphertext	O
.	O
</s>
<s>
According	O
to	O
the	O
secret	O
regulations	O
in	O
force	O
at	O
that	O
time	O
,	O
outlined	O
in	O
Der	O
Schlüssel	O
M	O
-	O
Verfahren	O
M	O
Allgemein	O
(	O
The	O
Cipher	B-Application
M	O
−	O
M	O
General	O
Procedure	O
)	O
,	O
this	O
procedure	O
was	O
used	O
primarily	O
to	O
give	O
radio	O
messages	O
different	O
lengths	O
(	O
"	O
Cipher	B-Application
M	O
"	O
refers	O
to	O
the	O
Enigma	O
M4	O
,	O
naval	O
variant	O
of	O
the	O
series	O
of	O
Enigma	O
machines	O
)	O
.	O
</s>
<s>
By	O
introducing	O
wahlworts	B-Algorithm
of	O
different	O
lengths	O
at	O
the	O
beginning	O
or	O
the	O
end	O
of	O
the	O
sentence	O
,	O
sometimes	O
both	O
the	O
beginning	O
and	O
the	O
end	O
,	O
the	O
length	O
of	O
the	O
messages	O
differ	O
,	O
which	O
prevented	O
or	O
at	O
least	O
hindered	O
the	O
enemy	O
from	O
accessing	O
it	O
.	O
</s>
<s>
The	O
length	O
of	O
a	O
wahlwort	B-Algorithm
was	O
usually	O
between	O
four	O
and	O
fourteen	O
letters	O
.	O
</s>
<s>
Wahlworts	B-Algorithm
with	O
only	O
three	O
letters	O
occasionally	O
appeared	O
in	O
the	O
code	O
,	O
such	O
as	O
ABC	O
or	O
XXX	O
,	O
but	O
also	O
very	O
long	O
compounds	O
,	O
such	O
as	O
Donaudampfschiffahrtsgesellschaftskapitän	O
(	O
Danube	O
steamboating	O
association	O
captain	O
)	O
or	O
Hottentottenpotentatentantenattentäter	O
(	O
Hottentot	O
potentate	O
aunt	O
assassin	O
)	O
.	O
</s>
<s>
The	O
rationale	O
for	O
choosing	O
more	O
or	O
less	O
meaningful	O
German	O
words	O
as	O
wahlworts	B-Algorithm
(	O
specifically	O
compound	O
nouns	O
)	O
as	O
opposed	O
to	O
random	O
text	O
such	O
as	O
CIHJT	O
UUHML	O
,	O
was	O
so	O
that	O
the	O
authorized	O
recipient	O
could	O
verify	O
that	O
their	O
deciphering	O
of	O
the	O
radio	O
message	O
was	O
error-free	O
.	O
</s>
<s>
However	O
,	O
according	O
to	O
regulations	O
,	O
wahlworts	B-Algorithm
were	O
required	O
to	O
be	O
entirely	O
unrelated	O
to	O
the	O
content	O
of	O
the	O
actual	O
radio	O
message	O
,	O
and	O
to	O
not	O
"	O
infringe	O
on	O
discipline	O
and	O
order.	O
"	O
</s>
<s>
Wahlworts	B-Algorithm
were	O
also	O
used	O
in	O
conjunction	O
with	O
other	O
ciphering	O
machines	O
such	O
as	O
the	O
Geheimschreiber	O
(	O
secret	O
teleprinter	O
)	O
Siemens	O
&	O
Halske	O
T52	O
.	O
</s>
<s>
"	O
Introduced	O
in	O
1940	O
on	O
a	O
wholesale	O
scale	O
,	O
wahlworts	B-Algorithm
might	O
have	O
knocked	O
out	O
the	O
infant	O
Crib	O
Room	O
before	O
it	O
had	O
got	O
properly	O
on	O
its	O
feet.	O
"	O
</s>
<s>
The	O
introduction	O
of	O
wahlworts	B-Algorithm
,	O
which	O
was	O
first	O
observed	O
by	O
the	O
British	O
in	O
1942	O
in	O
North	O
Africa	O
,	O
impeded	O
the	O
codebreaker	O
's	O
work	O
.	O
</s>
<s>
However	O
,	O
at	O
that	O
time	O
the	O
British	O
were	O
so	O
well	O
acquainted	O
with	O
the	O
German	O
methods	O
that	O
there	O
was	O
no	O
stopping	O
their	O
continued	O
success	O
in	O
code-breaking	O
,	O
despite	O
the	O
wahlworts	B-Algorithm
.	O
</s>
<s>
It	O
was	O
a	O
nuisance	O
for	O
them	O
to	O
have	O
to	O
try	O
out	O
the	O
various	O
possibilities	O
pertaining	O
to	O
the	O
word	O
order	O
of	O
the	O
text	O
when	O
they	O
did	O
not	O
know	O
the	O
length	O
of	O
the	O
wahlworts	B-Algorithm
,	O
but	O
this	O
could	O
not	O
stop	O
them	O
from	O
deciphering	O
the	O
text	O
.	O
</s>
<s>
Post-war	O
British	O
review	O
of	O
the	O
German	O
wahlwort	B-Algorithm
method	O
revealed	O
the	O
practice	O
to	O
be	O
"	O
too	O
little	O
and	O
too	O
late	O
"	O
.	O
</s>
<s>
As	O
with	O
other	O
German	O
measures	O
attempting	O
to	O
strengthen	O
the	O
cryptographic	O
security	O
of	O
Enigma	O
,	O
for	O
example	O
the	O
introduction	O
of	O
the	O
cryptographically	O
strong	O
methods	O
of	O
the	O
Enigma	O
Uhr	O
(	O
clock	O
)	O
,	O
or	O
the	O
pluggable	O
UKW	O
D	O
(	O
nick-named	O
Uncle	O
Dick	O
by	O
the	O
British	O
)	O
,	O
wahlworts	B-Algorithm
failed	O
because	O
they	O
were	O
not	O
introduced	O
comprehensively	O
and	O
were	O
adopted	O
too	O
late	O
in	O
the	O
war	O
.	O
</s>
