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LOBSTER OUT :
(in certain types of Enigma machine). To break or recover (a key) by
utilizing the characteristics of lobsters and the fact that message-settings
have been enciphered twice on the basic Grundstellung.
LOG-READER :
Person engaged in reading W/T interception logs and obtaining W/T and
other intelligence therefrom.
LONG SUBTRACTOR :
A subtractor which is longer, usually much longer, than any text to
which it is likely to be applied.
LOW ECHELON :
Used by or concerning Divisional H.Q. and lower authorities.
LOW-GRADE :
(of a code or code system). Not expected to resist attempts to
break it for long, esp. if used to any great extent; usually
employing only one encoding or enciphering process, and that a fairly
simple one. e.g. simple substitution, periodic substitution within a
short period, simple transposition, unreciphered code.
MACHINE CIPHER :
A cipher system in which the enciphering and deciphering are performed
by means of a machine.
MACHINE GUN :
A special attachment, characteristic of the Jumbo type of bombe, for
dealing with stops involving legal contradictions, i.e. contradictions
of the type A steckered to X and B steckered to X, where A and B are
in the Menu, and making a noise suggestive of a machine-gun when so
doing.
MAIN TABLE :
(in certain code-books which have two meanings assigned to one group).
That portion of the code which includes the first, or principal meanings
only. cf. auxiliary table.
MAJOR DIFFERENCE :
The larger of the two differences obtained when two code or cipher
groups are subtracted the one from the other and the other from the
one; it is normally numerically greater than a series of 5's.
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