Intelligence and Counterintelligence : Cryptography: Cracking Codes

Beginning with definitions of such basic terms as cryptanalysis, encryption, and decryption, this introduction from the Intelligence and Counterintelligence series emphasizes the point that cryptography is now a part of everyday business, not limited to espionage and the military. The narrative explains how various ciphers are constructed, from the simplest to the most complex, then covers basic concepts and types of cryptanalysis. After a short overview of cryptology through history, the survey concludes with a look at the development of modern electronic cryptology. Facts and concepts are well organized and clearly presented, but sources are not cited. Charts, photographs, and sidebars add visual variety, but this study is best suited for the serious student, not the casual browser. Back matter includes a glossary, a bibliography, and an index. Grades 9-12. --Linda Perkins Bookmarks from Cryptography Cracking Codes.pdf......Page 0 Cover......Page 1 Half Title......Page 2 Title......Page 4 Copyright......Page 5 Contents......Page 6 Introduction......Page 9 Chapter 1: Cryptography, Cryptanalysis, and Cryptology......Page 18 The Fundamentals of Codes, Ciphers, and Authentication......Page 19 Cryptology in Private and Commercial Life......Page 25 Identity Theft......Page 29 Transposition Ciphers......Page 32 Substitution Ciphers......Page 34 Playfair Ciphers......Page 35 Vigenère Ciphers......Page 37 Vernam-Vigenère Ciphers......Page 41 William and Elizebeth Friedman......Page 44 Product Ciphers......Page 45 Single-Key Cryptography......Page 47 Two-Key Cryptography......Page 48 Public-Key Cryptography......Page 50 Secret-Sharing......Page 52 RSA Encryption......Page 53 Prime Numbers......Page 55 Block and Stream Ciphers......Page 56 Chapter 4: Cryptanalysis......Page 58 Basic Aspects......Page 59 The Zimmermann Telegram......Page 60 Types of Cryptanalysis......Page 63 Chapter 5: Early Manual and Mechanical Cryptography......Page 67 The First Systems......Page 68 World Wars I and II......Page 71 Alan Turing’s Bombe......Page 76 Chapter 6: Modern Electronic Cryptography......Page 80 The Impact of Electronics......Page 81 Fibonacci’s Numbers......Page 84 DES and AES......Page 85 Conclusion......Page 91 Glossary......Page 92 Bibliography......Page 94 Index......Page 95 Back Cover......Page 98 "Double agents, code-cracking, and covert operations are not just the stuff of action movies or thrillers. Intelligence communities--comprised of spies as well as cryptographers and experts in a variety of other fields--have played significant roles in both past and present wars as well as in determining foreign threats, such as terrorism, to national security. The seemingly mystery-shrouded world of intelligence agencies and the tactics, strategies, and operations associated with them are made accessible to readers through an in-depth look at intelligence agencies around the world as well as the fundamentals of cryptography"--The publisher While cracking a code might seem like something few of us would encounter in our daily lives, it is actually far more prevalent than we may realize. Anyone who has had personal information taken because of a hacked email account can understand the need for cryptography and the importance of encryption—essentially the need to code information to keep it safe. This detailed volume examines the logic and science behind various ciphers, their real world uses, how codes can be broken, and the use of technology in this oft-overlooked field. Examines cryptography, discussing the history of the science, different cipher types, and how codes and codebreaking have changed with computers