The magnificent, unrivaled history of codes and ciphers -- how they're made, how they're broken, and the many and fascinating roles they've played since the dawn of civilization in war, business, diplomacy, and espionage -- updated with a new chapter on computer cryptography and the Ultra secret. 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.

Love Songs from al-Andalus presents an updated survey of the debates concerning Andalusian strophic poetry and their Kharjas. Attention is focused on the texts themselves and their literary implications as testimonies of the multicultural and multilingual society of al-Andalus. Since languages and alphabets of the three major religions have been used, these texts are studies historically, prosodically, thematically and stylistically and are related to the three literary traditions. One of the novelties of this study is the fact that it has been based upon the most updated edition and interpretations of the texts introducing emendations in over a third of its contents and making obsolete most of the hundreds of previous articles and books on the topic. Another novelty is the fact that stylistic features have been studied according to the Arabic model, casting new light on them. The survey of thematic relationships and the analysis of code-switching phenomena add weight to the conclusions of this research.

A full-scale historical treatment of the advent of printing and its importance as an agent of change, first published in 1980.