TheCodeBreakers
attack or division, that had fallen entirely within a single encipherment
group and so had been monoalphabetically enciphered. Such a system
does not interpose insuperable difficulties to the cryptanalyst, especially
when, as with the Russians, it was poorly used, often with intermixture
of plaintext. Mixed text was soon prohibited, but by then it was too late.
For the brilliant young Captain Hermann Pokorny, head of the
Russian subsection of the Austro-Hungarian Dechif-frierdienst, had
cracked the system and reconstructed all its alphabets by September 19.
His first important solution, on September 25, disclosed General
Novikov's lengthy
report of his reconnaissance of Central Powers troops, with his
additional note: "I took the decision of not crossing the Vistula." The
message was dated 8:40 a.m.; by 4 p.m. the Austrian liaison officer had
brought it to the attention of the German headquarters. Knowledge of
annaabi.ee 
