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Thorough, systematic introduction to serious cryptography, especially strong in modern forms of cipher solution used by experts. Simple and advanced methods. 166 specimens to solve — with solutions.
Includes "166 cryptograms."
Das Buch gibt eine umfassende Einführung in moderne angewandte Kryptografie. Es behandelt nahezu alle kryptografischen Verfahren mit praktischer Relevanz. Es werden symmetrische Verfahren (DES, AES, PRESENT, Stromchiffren), asymmetrische Verfahren (RSA, Diffie-Hellmann, elliptische Kurven) sowie digitale Signaturen, Hash-Funktionen, Message Authentication Codes sowie Schlüsselaustauschprotokolle vorgestellt. Für alle Krypto-Verfahren werden aktuelle Sicherheitseinschätzungen und Implementierungseigenschaften beschrieben.
Dieses Kryptographiebuch behandelt die grundlegenden Techniken der modernen Kryptographie. Es eignet sich hervorragend für Studierende der Mathematik und der Informatik ab dem dritten Semester. Das Buch setzt nur minimale Kenntnisse voraus und vermittelt auf elementare Weise die notwendigen mathematischen Kenntnisse, insbesondere die aus der Zahlentheorie. Die Leser werden durch diese Einführung in die Lage versetzt, fortgeschrittene Literatur zur Kryptographie zu verstehen.
Cryptography, the art and science of creating secret codes, and cryptanalysis, the art and science of breaking secret codes, underwent a similar and parallel course during history. Both fields evolved from manual encryption methods and manual codebreaking techniques, to cipher machines and codebreaking machines in the first half of the 20th century, and finally to computerbased encryption and cryptanalysis from the second half of the 20th century. However, despite the advent of modern computing technology, some of the more challenging classical cipher systems and machines have not yet been successfully cryptanalyzed. For others, cryptanalytic methods exist, but only for special and advantageous cases, such as when large amounts of ciphertext are available. Starting from the 1990s, local search metaheuristics such as hill climbing, genetic algorithms, and simulated annealing have been employed, and in some cases, successfully, for the cryptanalysis of several classical ciphers. In most cases, however, results were mixed, and the application of such methods rather limited in their scope and performance. In this work, a robust framework and methodology for the cryptanalysis of classical ciphers using local search metaheuristics, mainly hill climbing and simulated annealing, is described. In an extensive set of case studies conducted as part of this research, this new methodology has been validated and demonstrated as highly effective for the cryptanalysis of several challenging cipher systems and machines, which could not be effectively cryptanalyzed before, and with drastic improvements compared to previously published methods. This work also led to the decipherment of original encrypted messages from WWI, and to the solution, for the first time, of several public cryptographic challenges.
During and after the English civil wars, between 1640 and 1690, an unprecedented number of manuals teaching cryptography were published, almost all for the general public. While there are many surveys of cryptography, none pay any attention to the volume of manuals that appeared during the seventeenth century, or provide any cultural context for the appearance, design, or significance of the genre during the period. On the contrary, when the period’s cryptography writings are mentioned, they are dismissed as esoteric, impractical, and useless. Yet, as this book demonstrates, seventeenth-century cryptography manuals show us one clear beginning of the capitalization of information. In their pages, intelligence—as private message and as mental ability—becomes a central commodity in the emergence of England’s capitalist media state. Publications boasting the disclosure of secrets had long been popular, particularly for English readers with interests in the occult, but it was during these particular decades of the seventeenth century that cryptography emerged as a permanent bureaucratic function for the English government, a fashionable activity for the stylish English reader, and a respected discipline worthy of its own genre. These manuals established cryptography as a primer for intelligence, a craft able to identify and test particular mental abilities deemed "smart" and useful for England’s financial future. Through close readings of five specific primary texts that have been ignored not only in cryptography scholarship but also in early modern literary, scientific, and historical studies, this book allows us to see one origin of disciplinary division in the popular imagination and in the university, when particular broad fields—the sciences, the mechanical arts, and the liberal arts—came to be viewed as more or less profitable.

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