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KRYHA MACHINE :
Cipher machine consisting essentially of two circular alphabets, one
rotating against the other, and a third wheel which imparts a variable
kick to the rotating wheel after the encipherment of each letter.
KTF :
(short for Klartextfunktion). An autoclave element found in certain
Tunny links consisting in the addition (non-carrying in the scale of
two) of the fifth impulse of the preceding plain letter to the pattern
of the second chi-wheel (cf. chi-2 function), followed by Boolean addition
of the reverse of this result to the pattern produced by the two motor-
wheels for the next position, the net result being the motor for that
position, and designed to avoid giving depth even when the same message-
setting is used more than once; also, a similar autoclave element applied
to the key of the Sturgeon machine.
LAGE :
A list of Enigma keys showing the menus being run or waiting to be run
on bombes at a particular time, with details of their structure and
quality and the number of wheel-orders to be used; also the bombe
situation revealed by such a list.
LANDLINE :
(esp.). Over-land telephone or telegraph (making use of wireless
unnecessary).
LASH-UP :
A more or less improvised working model (of a machine or other ciphering
device, etc.); = mock-up.
LATIN SQUARE
Square usually of 26 alphabets (or any number of series of different
numbers) so arranged that each row and each column contains every
letter or number.
LEFT. TO THE LEFT OF :
(in a series of figures, letters or other characters regarded as
written from left to right and in successive lines under each other).
In front of, earlier than.
LETTER-SUBTRACTOR. :
Employing letters which, having different numerical or positional
values assigned to each, can be subtracted (non-carrying) from each
other, as in Hagelin machines.
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