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BREAK-IN :
The first success in begining to read or break a cipher or
code.
BREAK-SIGN :
A letter or other symbol used to separate words.
BREAKABLE :
Capable of being read or solved.
BRUTE FORCE :
Involving detailed analysis of the whole of a large volume of
reciphered code traffic.
BUILD-UP :
To construct or reconstruct, especially by a gradual process.
BURY :
To place (call signs, addresses, signatures, etc.) in other
than their natural places; to hide or conceal in the body of
a message (so as to avoid giving cribs).
BUTTON-UP :
(in Enigma). To add a particular letter to each of the letters
in both components of a cipher alphabet.
CAGE :
1. Rectilinear figure drawn round the text of a tranposition
cipher written out on its key-length, or one of its key-
lengths, on squared paper, and therefore consisting of a
rectangle of small squares or, more usually, several complete
and one incomplete line of small squares, e.g.
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