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TWO-PART :
(of a code-book). Having the code-groups so assigned to the plain
language units that when the latter are in alphabetical order the code-
groups are not in numerical order, and so involving a second or >decode
section in which the code-groups are in numerical order and the plain
language units not in alphabetical order; non-alphabetical; hatted.
TYPEX :
A British cipher machine.
TYPEX, v :
UMKEHRWALZE :
The wheel on the left side of an Enigma machine, fixed in position in
some models and designed to turn over in others, serving to connect
the twenty-six circuits constituted by the wiring of the other wheels
in fixed (or, in some models, in variable) pairs; the returning or
reflector wheel.
UNBUTTON :
(in Enigma). To subtract a particular letter or value from each of
the letters in both components of a cipher alphabet.
UNDECODABLE :
(apparently misused for). Undecipherable.
UNDERLYING :
(of a code-book). Concealed or disguised in cipher messages by
recipherment.
UNDUPED :
(of a cipher text). Of which no alternative (independently intercepted)
version is available.
UNENCIPHERED :
(misused for). Unreciphered.
UNRECODED :
(misused for). Unreciphered.
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