# Cryptography / Declassified

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Category: Technology
Slides: 14
Updated: 2026-05-15T22:19:45.508Z
Tags: catalog, tech, cryptography

## Summary

Julius Caesar protected military dispatches with a substitution so simple a soldier could memorize it: shift every letter of the plaintext forward by three positions in the alphabet. Key sections include: Cryptography / Declassified; ~ 50 BC: The Caesar Cipher; 9th c.: Al-Kindi & Frequency Analysis; 1466: Alberti's Cipher Disk; 1939–45: Enigma & the Bombe; 1976: Diffie-Hellman Key Exchange; 1977: RSA — Public Keys for Everyone; 1991: PGP — Pretty Good Privacy; 2001: AES — The Modern Standard; Elliptic Curves & TLS 1.3.

## Slide Outline

1. Cryptography / Declassified
2. ~ 50 BC: The Caesar Cipher
3. 9th c.: Al-Kindi & Frequency Analysis
4. 1466: Alberti's Cipher Disk
5. 1939–45: Enigma & the Bombe
6. 1976: Diffie-Hellman Key Exchange
7. 1977: RSA — Public Keys for Everyone
8. 1991: PGP — Pretty Good Privacy
9. 2001: AES — The Modern Standard
10. Elliptic Curves & TLS 1.3
11. 2008: Bitcoin — Cryptography for Money
12. The Post-Quantum Threat
13. Further Reading
14. Video Dispatches

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