Author of "The Codebreakers - The Story of Secret Writing", considered by many to be the definitive history of cryptography up to its publication in 1968.  A 1996 edition added a single new chapter which provides some additional information and context.

Wikipedia: https://en.wikipedia.org/wiki/David_Kahn_(writer)

Wikipedia entry on the book https://en.wikipedia.org/wiki/The_Codebreakers