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COVERAGE :
Adequacy of provision for intercepting wireless signals (of a
particular type or link of traffic).
CRACK :
To make a beginning in the process of reading or solving a cipher
or code.
CRASH :
(in any reciprocal substitution system, and esp. in Enigma). The
occurrence of a plain letter opposite the same letter in the cipher
text in one of the positions or versions in which a crib is tried,
normally involving rejection of that position or version.
CRASH , v :
1. (of a crib or version of a crib). To involve the enciphering
of a letter by itself at a particular position (which is
impossible from the structure of the Enigma machine or in any
substitution system having a reciprocal character).
2. Misused for clash.
CREAM-RUN :
A series of three or more positional repeats (of groups of reciphered
code), suggesting a high probability of depth.
CREEPING SUBTRACTOR :
A subtractor having a fixed starting-point, e.g. for each day or other
suitable period, the starting-point for each successive day or period
being advanced a prescribed (and usually regular) number of units.
CRIB :
A plain language (or code) passage of any length, usually obtained
by solving one or more cipher or code messages, and occurring or
believed likely to occur in a different cipher or code message,
which it may provide a means of solving.
CRIB, v :
CRIBBABLE :
Capable of being solved by means of a crib.
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