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BOIL :
Method for determining the clear text of a large number of Enigma
messages which begin or end in the same way, utilizing the fact that
no letter can be enciphered by itself, i.e. by noting the missing
letters in each column when the beginnings or ends are written below
each other.
BOMBE :
Apparatus for breaking Enigma daily keys, i.e. ascertaining wheel-
order, ringstellung, and stecker, by testing a crib and its
implications in all possible settings and wheel-orders.
BONK :
1. (in Enigma). To bring (a hand machine) to any desired position
by depressing a key or keys the requisite number of times.
2. Bonk out, to encipher or decipher on a hand machine.
BOOK :
BOOK, v :
To record occurrences of (cipher or code-groups, either true or
provisional, indicators, etc.) in a book, e.g. in the process of
book-breaking.
BOOK-BREAKER :
A cryptographer who specializes in determining the plain language
represented by the code-groups of messages from which the reciphering
key or subtractor (true or provisional), or other form of recipherment,
if any, has been removed, with a view to reconstructing the original
(decode) form of the code-book employed, or enough of this to make
the traffic readable.
BOOK-BREAKING :
The work of a book-breaker; reconstruction of the decode form of a
code-book.
BOOK FACTOR :
(of difference book). Proportion of total material in a particular
type of traffic represented by the "good groups" from which the
difference book has been made.
BOOK INDICATOR :
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