Th3 H1$tory of Cryptogr@phy
summary
Timeline of practical claims and breakthroughs: Mary Queen of Scots is convicted after intercepted letters are deciphered (1587); Julius Caesar’s 3‑shift cipher appears but substitution survives centuries until 9th‑century al‑Kindi invents frequency analysis, breaking monoalphabetic systems. Alberti and later Vigenère introduce polyalphabetic ciphers using 26 shifting alphabets; Babbage and Kasiski expose repeated‑key weakness (example key reduced to 5 letters). 20th century brings mechanical Enigma work and Alan Turing methods; Diffie‑Hellman solves key distribution and RSA (Rivest‑Shamir‑Adleman) becomes the practical public‑key scheme securing today’s Internet.
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chapters (5)
- 0:00Start
- 9:05Substitution Cipher
- 15:02How To Apply Frequency Analysis
- 26:44Babbage Broke the Visionaire Cipher
- 30:10Current State of Cryptography
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