TheCodeBreakers
transposition to the j!9 code. The Japanese embassy in the Soviet Union
began relying heavily on this code in October of 1941, when the Soviet
government moved its capital eastward from threatened Moscow to
Kuibyshev. The diplomats had to stay close to the seat of government,
and the Japanese may have junked their heavy cipher machine instead
of moving it, using their paper codes instead. Pers z made its first break
by spotting two messages which had patches of identical letters
separated by nonidentical sections. Deducing that these differing
portions represented the same placode text, the cryptanalysts compared
the two messages until, in a single afternoon, they found a transposition
and blank arrangement that yielded the same texts in a form that
resembled legitimate codewords. In one of their greatest technical
successes, the mathematical cryptanalysts cracked the approximately 30
transposition and blank patterns; the linguists read the code, and the
annaabi.ee 
