TheCodeBreakers
subsequent solutions pro vided the Germans with information about
Russian war production and army activities.
[Codebreakers 220.jpg]
Pers z solution of an encoded message of Robert Murphy to the State Department dealing
with highly secret negotiations with General Weygand in North Africa in 1941
Pers z was an old hand at reading American codes. It had long studied
the American superencipherment. The codewords were only of the cucuc
and cuccu types (c = consonant, v = vowel); to encipher, the code clerk
split them into a single consonant and two cu or uc groups, then
replaced these segments with substitutes from the appropriate tables.
This superencipherment left the cucuc and cuccu configuration of the
codegroup unchanged, and this regularity enabled the Pers z
mathematicians to break first into this original system and, in 1940, into
a modification of it._ Ironically, changes of superencipherment within a
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