“A tremendous tale of hushed and unhushed uproars in the linked fields of war and diplomacy” (The New York Times), from the Pulitzer Prize–winning author of The Guns of August In January 1917, the war in Europe was, at best, a tragic standoff. Britain knew that all was lost unless the United States joined the war, but President Wilson was unshakable in his neutrality. At just this moment, a crack team of British decoders in a quiet office known as Room 40 intercepted a document that would change history. The Zimmermann telegram was a top-secret message to the president of Mexico, inviting him to join Germany and Japan in an invasion of the United States. How Britain managed to inform the American government without revealing that the German codes had been broken makes for an incredible story of espionage and intrigue as only Barbara W. Tuchman could tell it. The Proud Tower, The Guns of August, and The Zimmermann Telegram comprise Barbara W. Tuchman’s classic histories of the First World War era.

In May 1917, William and Elizebeth Friedman were asked by the U.S. Army to begin training officers in cryptanalysis and to decrypt intercepted German diplomatic and military communications. In June 1917, Herbert Yardley convinced the new head of the Army’s Military Intelligence Division to create a code and cipher section for the Army with himself as its head. These two seminal events were the beginning of modern American cryptology, the growth of which culminated 35 years later with the creation of the National Security Agency. Each running their own cryptologic agencies in the 1920s, the Friedman-Yardley relationship was shattered after Yardley published a tell-all book about his time in military intelligence. Yet in the end, the work they all started in 1917 led directly to the modern American intelligence community. As they got older, they became increasingly irrelevant in the burgeoning American cryptologic fraternity. Topics and features: * Examines the lives of three remarkable and pioneering cryptologists * Offers fascinating insights into spies, codes and ciphers, rumrunners, poker, and military history * Sheds new light on interesting parts of the cryptologists’ careers—especially Elizebeth Friedman, whose work during World War II has just begun to be explored * Recounts several good stories, i.e., What if the Friedmans had gone to work for Herbert Yardley in his new Cipher Bureau in 1919? What if Yardley had moved back to Washington to work for William Friedman a decade later? This enjoyable book has wide appeal for: general readers interested in the evolution of American cryptology, American historians (particularly of World War I, the inter-war period, and World War II signals intelligence), and historians of—and general readers interested in—American military intelligence. It also can be used as an auxiliary text or recommended reading in introductory or survey courses in history or on the related topics.

This accessible textbook presents a fascinating review of cryptography and cryptanalysis across history. The text relates the earliest use of the monoalphabetic cipher in the ancient world, the development of the “unbreakable” Vigenère cipher, and an account of how cryptology entered the arsenal of military intelligence during the American Revolutionary War. Moving on to the American Civil War, the book explains how the Union solved the Vigenère ciphers used by the Confederates, before investigating the development of cipher machines throughout World War I and II. This is then followed by an exploration of cryptology in the computer age, from public-key cryptography and web security, to criminal cyber-attacks and cyber-warfare. Looking to the future, the role of cryptography in the Internet of Things is also discussed, along with the potential impact of quantum computing. Topics and features: presents a history of cryptology from ancient Rome to the present day, with a focus on cryptology in the 20th and 21st centuries; reviews the different types of cryptographic algorithms used to create secret messages, and the various methods for breaking such secret messages; provides engaging examples throughout the book illustrating the use of cryptographic algorithms in different historical periods; describes the notable contributions to cryptology of Herbert Yardley, William and Elizebeth Smith Friedman, Lester Hill, Agnes Meyer Driscoll, and Claude Shannon; concludes with a review of tantalizing unsolved mysteries in cryptology, such as the Voynich Manuscript, the Beale Ciphers, and the Kryptos sculpture. This engaging work is ideal as both a primary text for courses on the history of cryptology, and as a supplementary text for advanced undergraduate courses on computer security. No prior background in mathematics is assumed, beyond what would be encountered in an introductory course on discrete mathematics.

Why do states still need diplomats? Despite instantaneous electronic communication and rapid global travel, the importance of ambassadors and embassies has in many ways grown since the middle of the nineteenth century. However, in theories of international relations, diplomats are often neglected in favor of states or leaders, or they are dismissed as old-fashioned. David Lindsey develops a new theory of diplomacy that illuminates why states find ambassadors indispensable to effective intergovernmental interaction. He argues that the primary diplomatic challenge countries face is not simply communication—it is credibility. Diplomats can often communicate credibly with their host countries even when their superiors cannot because diplomats spend time building the trust that is vital to cooperation. Using a combination of history, game theory, and statistical analysis, Lindsey explores the logic of delegating authority to diplomats. He argues that countries tend to appoint diplomats who are sympathetic to their host countries and share common interests with them. Ideal diplomats hold political preferences that fall in between those of their home country and their host country, and they are capable of balancing both sets of interests without embracing either point of view fully. Delegated Diplomacy is based on a comprehensive dataset of more than 1,300 diplomatic biographies drawn from declassified intelligence records, as well as detailed case studies of the U.S. ambassadors to the United Kingdom and Germany before and during World War I. It provides a rich and insightful account of the theory and practice of diplomacy in international relations.