David Sherman has a very interesting journal article on the obstacles the US and UK Governments put up to the publication of some of the material in that 1967 first edition of The Codebreakers. Kahn eventually became beloved of the NSA which had him as a visiting historian for a time. 🧵

The Codebreakers war: David Kahn, Macmillan, the government, and the making of a cryptologic history masterpiece

David Kahn’s The Codebreakers, published in 1967, is the first modern comprehensive history of cryptology. Based on extensive research, including interviews with former government cryptologists in ...