TheCodeBreakers
During World War II, the secret prospectors of the G.R.U. and the
N.K.V.D. drilled for information in scores of places all over the world.
Three of the spy crews struck gushers of it. The fabulous "Lucy" network
in Switzerland, the Rote Kapelle in Germany, and the Sorge ring in Japan
pumped a continuous stream of the most detailed and precise
intelligence into the Kremlin. And this they did through a pipeline that,
despite the most strenuous bang-ings and poundings of
counterintelligence, remained hermetically sealed against cryptanalysis.
All three rings employed the then-standard Soviet espionage cipher. It
achieved a triumph of encipherment, for it is a system that the
spymasters of the Soviet Union rightly regarded as unbreakable.
It brought the old Nihilist substitution to a peak of perfection. It
merged the straddling checkerboard with the one-time key.
It increased the efficiency of the checkerboard by specifically giving
annaabi.ee 
