 Название: Codes, Ciphers, Steganography & Secret Messages
Автор: Sunil Tanna
Издательство: Answers 2000 Limited
Год: 2020
Страниц: 263
Язык: английский
Формат: epub
Размер: 10.5 MB
Discover the science of cryptology! This book is a complete introduction to codes, ciphers and secret messages. You will discover:
- How codes and ciphers work
- How secret messages can be concealed in apparently innocuous messages (steganography)
- How codebreakers and cryptanalysts break codes and ciphers
- Many examples of how codes and ciphers have changed history and continue to shape the world to this day
Enigma (see Chapter 8) was an electromechanical machine that enciphered and deciphered messages. It was used by Germany in the interwar years and during World War II. The general principle of Enigma was that messages would be enciphered by the sender using the machine and then transmitted by Morse code over the radio as encoded ciphertext. The recipient would transcribe the Morse code, and then enter it into their own Enigma machine to decipher the message. The radio signals could of course be intercepted by the German’s enemies, but the Germans (wrongly) believed that their messages were secure, since they did not think that Allied cryptanalysts would be able to break the cipher.
Table of Contents:
Introduction: What are Codes, Ciphers and Steganography?
Chapter 1: Codes used for Communication
Flag Code
Semaphore Code
Polybius Square
Optical Telegraph Codes
Electrical Telegraph Codes
- International Morse Code
- Baudot Code
- Murray Code and ITA 2
- ASCII
Computer Codes
Chapter 2: Caesar Ciphers
Using a Caesar Cipher
Variations of the Caesar Cipher
- ROT13
- ROT5
- ROT18
- ROT47
- Avgad and Albam
Breaking Caesar Ciphers
Chapter 3: Simple Substitution Ciphers
Atbash Cipher
Simple Alphabet Substitution Ciphers
Simple Symbolic Substitution Ciphers
- Pigpen Cipher
Breaking Simple Substitution Ciphers
- Frequency Analysis
- Cribs
Defeating Frequency Analysis
- Short Messages
- Homophony
- Null Characters
- Other Methods
Chapter 4: Transposition Ciphers
Scytale
Rail Fence Ciphers
Route Ciphers
Columnar Transposition Ciphers
Double Columnar Transposition Ciphers
Myszkowski Transposition Ciphers
Disrupted Transposition Ciphers
Grille Ciphers
- Trellis Ciphers
- Fleissner Ciphers
- Crossword Ciphers
Chapter 5: Fractionation and Diffusion
Bifid Cipher
Trifid Cipher
Chapter 6: Polygraphic Substitution
Advantages and Disadvantages of Polygraphic Ciphers
Playfair Cipher
Two-Square Cipher
Four-Square Cipher
Chapter 7: Polyalphabetic Ciphers
Alberti Cipher
Trithemius Cipher
Vigenиre Ciphers
Beaufort and Variant Beaufort Cipher
Autokey Ciphers
Chapter 8: Enigma
The Enigma Machine
How Enigma was Broken
- Early British Efforts
- Polish Cipher Bureau
- Polish Cooperation with the Western Allies
- PC Bruno
- Cadix
- British Efforts Against Italian Naval Enigma
- The British Focus on Cribs
- British and American Bombes
- German Suspicions
Chapter 9: Perfect Ciphers
Vernam Cipher
One-Time Pads
Difficulties of Implementing a Perfect Cipher
- Protecting the Key
- Not Reusing the Key
- Randomness in the Key
- The Equipment Used Must Be Secure
Lorenz Cipher
- Cryptanalysis of the Lorenz Cipher
Chapter 10: Codewords
One-time Code
Nomenclator
Midway
Chapter 11: Book Ciphers
Book Word Substitution Ciphers
Book Letter Substitution Ciphers
Running Key Ciphers
Chapter 12: Computer Cryptography
Symmetric-Key Cryptography
Public-Key Cryptography
Cryptographic Hashes and Digital Signatures
Chapter 13: Steganography and Hidden Messages
Null Ciphers
Bacon’s Cipher
Grilles
Digital Steganography
- Image Files
- Audio Files
- Text and Word Processor Files
- Network Communications
- Other Examples
Chapter 14: Famous Codes, Ciphers and Cryptograms – Solved and Unsolved
Voynich Manuscript
Babington Plot Ciphers
Olivier Levasseur
Shugborough Inscription
Copiale Cipher
The Gold Bug
Beale Ciphers
Rohonc Codex
D'Agapeyeff Cipher
Dorabella Cipher
Zimmerman Telegram
Zodiac Killer Ciphers
Kryptos
The Magic Words are Squeamish Ossifrage
Ricky McCormick's Encrypted Notes
Smithy Code
Conclusion
Скачать Codes, Ciphers, Steganography & Secret Messages
|
Навигация
Вход на сайт
Реклама
Codes, Ciphers, Steganography & Secret Messages 
