The Codebreakers

Man has created codes to keep secrets and has broken codes to learn those secrets since the time of the Pharaohs. For 4,000 years, fierce battles have been waged between codemakers and codebreakers, and the story of these battles is civilization's secret history, the hidden account of how wars were won and lost, diplomatic intrigues foiled, business secrets stolen, governments ruined, computers hacked. From the XYZ Affair to the Dreyfus Affair, from the Gallic War to the Persian Gulf, from Druidic runes and the kaballah to outer space, from the Zimmermann telegram to Enigma to the Manhattan Project, codebreaking has shaped the course of human events to an extent beyond any easy reckoning. Once a government monopoly, cryptology today touches everybody. It secures the Internet, keeps e-mail private, maintains the integrity of cash machine transactions, and scrambles TV signals on unpaid-for channels. David Kahn's The Codebreakers takes the measure of what codes and codebreaking have meant in human history in a single comprehensive account, astonishing in its scope and enthralling in its execution. Hailed upon first publication as a book likely to become the definitive work of its kind, The Codebreakers has more than lived up to that prediction: it remains unsurpassed. With a brilliant new chapter that makes use of previously classified documents to bring the book thoroughly up to date, and to explore the myriad ways computer codes and their hackers are changing all of our lives, The Codebreakers is the skeleton key to a thousand thrilling true stories of intrigue, mystery, and adventure. It is a masterpiece of the historian's art.

David Kahn, a recently visiting historian at the National Security Agency, is the world's leading expert on the history of cryptology, and the author of Hitler's Spies, Seizing the Enigma, and Kahn on Codes, as well as articles in numerous popular and technical journals. He holds a Ph.D. in Modern History from Oxford. An editor at Newsday, he lives in Great Neck, New York.

CONTENTS Preface to the Revised Edition Preface A Few Words 1. One Day of Magic THE PAGENT OF CRYPTOLOGY 2. The First 3,000 Years 3. The Rise of the West 4. On the Origin of a Species 5. The Era of the Black Chambers 6. The Contribution of the Dilettantes 7. Crises of the Union 8. The Professor, the Soldier, and the Man on Devil's Island 9. Room 40 10. A War of Intercepts: I 11. A War of Intercepts: II 12. Two Americans 13. Secrecy for Sale 14. Duel in the Ether: The Axis 15. Duel in the Ether: Neutrals and Allies 16. Censors, Scramblers, and Spies 17. The Scrutable Orientals 18. Russkaya Kriptologiya ("Russian Cryptology") 19. N.S.A. SIDESHOWS 20. The Anatomy of Cryptology 21. Heterogeneous Impulses 22. Rumrunners, Businessmen, and Makers of Non-secret Codes 23. Ciphers in the Past Tense 24. The Pathology of Cryptology PARACRYPTOLOGY 25. Ancestral Voices 26. Messages from Outer Space THE NEW CRYPTOLOGY 27. Cryptology Goes Public Bibliography Notes to Text Acknowledgments Notes to Illustrations Index