The Reader of Gentlemens Mail: Herbert O. Yardley and the Birth of American Codebreaking
by David Kahn
Category: Biography & Autobiography

Describes the life and work of one of American intelligence's most controversial figures from his early life, his pioneering work in cryptography during World War I, the writing of one of the most important works in cryptography-- The American Black Chamber, to his later years writing, running a restaurant, and playing poker.