Compromise of Soviet codes in WWII

[grarpamp]

http://chris-intel-corner.blogspot.gr/2014/07/compromise-of-soviet-codes-in-wwii.html

Overview of Soviet cryptosystems
The secretive Soviet state used various cryptosystems in order to
secure its communications from outsiders. The task of preparing and
evaluating cipher procedures was handled by two main Soviet
organizations, the NKVD’s 5th Department and the Army’s 8th department
of the main intelligence directorate GRU.

In the 1920’s simple substitution systems were used and these were solved by
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