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THROW-ON, n :
(in Enigma). A pair of letters representing two encipherments of the
same (unknown) letter at two different positions, esp. at a distance
of three or four in indicators that have been enciphered twice on a
Grundstellung.
THROW-ON, v :
(of Enigma indicators). To Box.
TIE-UP :
Relationship between two or more code or cipher systems or keys
arising from re-encodements from one to the other and offering
possibilities of cribbing.
T/L :
T/L I :
A list of identifications in a three-letter code.
TOP-AND-TAIL :
(of an Enigma crib). Involving the beginning and the end of a
message; also (of a menu), made up from such a crib.
TRAFFIC :
Messages or signals, especially code and cipher messages passed by
wireless or other means between any two or more particular stations
or of a particular type.
TRAIL :
(of a reciphered code message or part-message). To have its starting-
point on the subtractor a comparatively short distance after the
finishing-point of the last message or part-message sent by the same
encipherer; cf. Tailing.
TRANSPOSITION :
An enciphering or reciphering system or process whereby the plain
language letters (or figures or letters, etc. of an encoded or
enciphered version) of a message are rearranged among themselves
according to a key before transmission.
In ordinary transposition the message is written into a cage under
the key (q.v.2) from left to right, and copied out column by column
according to the order of the figures in the key. One such operation
is known as "simple transposition", When a second cage is used the
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