TheCodeBreakers
The
technique was far in advance of its time. So far as is known, not another
cryptanalyst on the globe could duplicate it—and none did, apparently,
for more than two decades. With this solution of Friedman's, world
leadership in cryptology passed to America.
Meanwhile, the Army had been studying its divided cryptologic
operation and, shortly before tie State Depart-
ment withdrew support from Yardley's bureau, hac decided to
integrate both cryptographic and cryptanaJytic functions in the Signal
Corps. The closing of the Black Chamber eased the transition, and on
May 10, 1929, cryptologic responsibility devolved upon the Chief Signal
Officer. To better meet these new responsibilities, the Signal Corps
established a Signal Intelligence Service in its War Plans and Training
Division, with Friedman as director. Its officially stated mission was to
prepare the Army's codes and ciphers, to intercept and solve enemy
annaabi.ee 
