These are the most frequently used words in another edition of this book.
111
against
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alphabets
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attack
between
bit
block
british
called
case
characters
cipher
code
column
cryptotext
cycle
de
decryption
encryption
enigma
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ii
iii
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key
known
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length
letters
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lie
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machine
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message
method
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now
number
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order
patterns
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rotor
second
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