TheCodeBreakers (0)

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Missives Babbage easily read a Caesar substitution of May 13 1859 addressed to Robert Why do you not come or write for me?

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Some of the things you will learn in THE CODEBREAKERS

• How secret Japanese messages were decoded in Washington hours before Pearl Harbor .
• How German codebreakers helped usher in the Russian Revolution .
• How John F. Kennedy escaped capture in the Pacific because the Japanese failed to solve a
simple cipher .
• How codebreaking determined a presidential election, convicted an underworld syndicate
head, won the battle of Midway , led to cruel Allied defeats in North Africa , and broke up a vast
Nazi spy ring.
• How one American became the world's most famous codebreaker, and another became the
world's greatest .
• How codes and codebreakers operate today within the secret agencies of the U.S. and Russia .
• And incredibly much more.
"For many evenings of gripping reading , no better choice can be made than this book."
— Christian Science Monitor

THE
Codebreakers

The Story of Secret Writing

By DAVID KAHN
( abridged by the author )

A SIGNET BOOK from
NEW AMERICAN LIBRARV
TIMES MIRROR

Copyright © 1967, 1973 by David Kahn
All rights reserved.
No part of this book may be reproduced or transmitted
in any form or by any means , electronic or mechanical ,
including photocopying, recording or by any information
storage and retrieval system, without permission in writing
from the publisher . For information address
The Macmillan Company, 866 Third Avenue, New York ,
New York 10022.
Library of Congress Catalog Card Number: 63-16109
Crown copyright is acknowledged for the following illustrations
from Great Britain 's Public Record Office:
S.P. 53/18, no. 55, the Phelippes forgery,
and P.R.O. 31/11/11, the Bergenroth reconstruction .
Published by arrangement with The Macmillan Company
FIRST PRINTING SECOND PRINTING THIRD PRINTING FOURTH PRINTING FIFTH PRINTING SIXTH PRINTING SEVENTH PRINTING
EIGHTH PRINTING NINTH PRINTING TENTH PRINTING
SIGNET TRADEMARK: REG. TJ.S. PAT. OFF. AND FOREIGN COUNTRIES
REGISTERED TRADEMARK---MARCA REGISTBADA
HECHO EN CHICAGO , U.S.A.
SIGNET, SIGNET CLASSICS, SIGNETTE, MENTOR AND PLUME BOOKS
are published by The New American Library, Inc.,
1301 Avenue of the Americas , New York, New York 10019
FIRST PRINTING, FEBRUARY , 1973
PRINTED IN THE UNITED STATES OF AMERICA

To my Parents
and my Grandmother

Contents
A Note on the Abridged Version
Preface
A Few Words
1. One Day of Magic : I
2. One Day of Magic: II
3.  The First 3,000 Years
4.  The Rise of the West
5.  On the Origin of a Species
6.  The Era of the Black Chambers
7.  The Contribution of the Dilettantes
8.   Room 40
9. A War of Intercepts
10.  Two Americans
11.  Secrecy for Sale
12. Duel in the Ether: I
13. Duel in the Ether: II
14. Censors, Scramblers, and Spies
15. The Scrutable Orientals
16. PYCCKAJI Kranrojioras
17. N.S.A.
18. Heterogeneous Impulses
19. Ciphers in the Past Tense
20. The Anatomy of Cryptology
Suggestions for Further Reading
Index
A Note on the Abridged Version

MANY PEOPLE have urged me to put out a paperback edition of The Codebreakers. Here it is.
It comprises about a third of the original . This was as big as the publishers and I could make it and still
keep the price within reason .
In cutting the book, I retained mainly stories about how codebreaking has affected history, particularly
in World War II, and major names and stages in the history of cryptology. I eliminated all source notes and
most of the technical matter , as well as material peripheral to strict codebreaking such as biographies, the
invention of secondary cipher systems, and miscellaneous uses of various systems.
I had no space for new material, but I did correct the errors reported to me and updated a few items .
The chapters have been slightly rearranged.

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