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DIRECT :
(of a cipher alphabet). Having both plain and cipher components
running in the same direction; (opp. to reversed).
DIRECTED :
(of investigations, analyses, etc.). Applied or operating within
certain prescribed limits, or based upon definite assumptions.
DIRECTED BOIL :
(in Enigma). A boil made to determine the relative likelihood of
particular cribs.
DIRECT ROD :
A rod showing the letters on the right side of a wheel of an Enigma
machine that are consecutively connected to a fixed point in space at
the left side, for the twenty-six different positions of that wheel
which occur in one revolution. Twenty-six such rods can be constructed
for each wheel, one for each of twenty-six fixed points on its left
side (corresponding to the contacts on a non-turning second wheel),
and when these are placed in a square in order the diagonals from
bottom left to top right all have the same alphabetic or other
(e.g. QWERTZU) sequence.
DISC :
DISC CIPHER :
A cipher employing a cipher disc.
DISCRIMINANT :
A group (or, rarely, two groups), placed normally in front of the text
of a cipher message, indicating - in the case of reciphered codes -
the particular code-book and reciphering key, and/or the cipher
procedure, used, or - in the case of machine ciphers - the particular
set-up used, and so serving to indicate the degree of secrecy of the
message or to distinguish one type or section of traffic from another.
DISCRIMINATE :
To use a discriminant group (or groups).
D.I.W. :
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