TheCodeBreakers
given cryptology shape and content; now the radio carried it out into the
arena of life. One gave it form; the other, meaning. The radio completed
the work that the telegraph had begun. And so it was that radio, first
widely used in the Great War of 1914 to 1918, brought cryptology to
maturity.
To the right of the imposing stone A.E.F. headquarters building at
Chaumont stood an undistinguished, single-story barracks of glass and
concrete. Sometimes called the "Glass House," the caserne housed the
other half of the American cryptologic effort, the Radio Intelligence
Section, G.2 A.6.
Its chief, Major Frank Moorman, 40, a native of Michigan, was a blue-
eyed, brown-haired Regular Army man who had worked his way up
through the infantry ranks from private. He was a 1915 graduate of the
Army Signal School and knew enough about cryptanalysis to devise an
ingenious method for almost automatically determining the letters of a
Playfair keyword
annaabi.ee 
