# History of Cryptography

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History of Cryptography AN EASY TO UNDERSTAND HISTORY OF CRYPTOGRAPHY Contents 1. Introduction 2. Classical Encryptions (Ancient Times) 3. Classical Encryptions (Middle Ages) The Cipher of Mary Queen of Scots Vigenère Ciphers Uesugi Cipher 3 4 6 6 6 7 4. Modern Ciphers: Ciphers during World War I and the Emergence of Encryption Machines German Communication Cables Disconnected by the United Kingdom Zimmermann Telegram ADFGVX Cipher The Birth of Enigma 8 8 8 8 9 5. Modern Ciphers: Encryptions in the Computer and Internet Era DES Cipher Public-Key Cryptosystem RSA Cipher Decrypting the DES Cipher Responsive Action of Cipher Enhancements for SSL 10 10 10 11 12 12 6. The Future of Encryption 7. Conclusion:…show more content…
The Caesar cipher method of encryption involves replacing each of the letters of the alphabet in the original text by a letter located a set number of places further down the sequence of the letters in the alphabet of the language. The sender and receiver agree in advance to replace each letter of the alphabet in the text by a letter that is, for example, three letters further down in their alphabet. An encryption method that involves rearranging the sequence of characters according to a specific rule such as that shown above is referred to as a “substitution cipher”. Substitution ciphers are a well-known encryption method, and they are the most commonly used encryption method in the history of encryption. The modern encryption machine called “Enigma” described below made it possible to apply the substitution cipher method with a higher level of sophistication. Plain text characters (text that has not been encrypted) Encryption characters SMKRATNGQJUDZLPVYOCWIBXFEH ABCDEFGHIJKLMNOPQRSTUVWXYZ example of a 26-letter alphabet: 26 x 25 x 24 x …. = 400,000,0 00,000,000,000,000,000,000 patterns!) and making decryption dramatically more difficult. example of encryption. Hieroglyphics were long considered impossible to ever read, but the discovery and study of the Rosetta