TheCodeBreakers
The book seeks to cover the entire history of
cryptology. My goal has been twofold: to narrate the development of the various methods of making and
breaking codes and ciphers, and to tell how these methods have affected men.
When I began this book, I, like other well-informed amateurs, knew about all that had been published
on the history of cryptology in books on the subject. How little we really knew! Neither we nor any
professionals realized that many valuable articles lurked in scholarly journals, or had induced any
cryptanalysts to tell their stories for publication, or had tapped the vast treasuries of documentary material,
or had tried to take a long view and ask some questions that now appear basic. I believe it to be true that,
from the point of view of the material previously published in books on cryptology, what is new in this
book is 85 to 90 per cent.
Yet it is not exhaustive. A foolish secrecy still clothes much of World War II cryptology—though I
annaabi.ee 
