Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...
1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes -- 7. Ciphers for spies -- 8. Producing random ...
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From scytale to cyber: cryptography’s epic journey
From ancient Egyptian tomb inscriptions to today’s quantum encryption, cryptography has been humanity’s shield for secrets. Across wars, political intrigue, and love letters, it has evolved from ...
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