TheCodeBreakers
outbreak of war. To carry out these duties, Friedman hired three junior
cryptanalysts, all in their early twenties, at $2,000 a year—the first of the
second generation of American cryptologists. They were Frank Rowlett, a
Virginian, and Solomon Kullback "and Abraham Sinkov, close college
friends who had taught together in New York City high schools before
coming to Washington and who both received their Ph.D.'s in
mathematics a few years later. It was the beginning of an expanion that
led to the PURPLE solution, the triumphs of World War II, and the massive
cryptologic organization of today. At his death on November 2, 1969, he
was widely regarded as the greatest cryptologist that science had ever
seen.
By this time the Navy, too, had its cryptologic section. Like the
Army's, it had evolved gradually.
Naval participation in the 1917 war was too limited for cryptanalytic
development, but interest was stimulated. Accordingly, in January of
1924, Lieutenant Laurance F
annaabi.ee 
