1. A Summary in Fifteen Minutes mas y menos
Cryptography
A Summary in Fifteen Minutes
mas y menos

2. History of Cryptography
Egyptian nonstandard hieroglyphs
Spartans Scytale
Caesar cipher
Religion text changed in numbers (Hebrew)
Poly-alphabetic cipher

3. History Continued Arabs and the complex principles
Europeans 1379 the first manual of crypto was written
1470 cipher disk was invented Leon Battista
1586 Blaise de Vigenere

4. World Wars WWI Zimmerman telegram Code Talkers WWII Enigma Alan Turing
Tommy Flowers

5. Modern Cryptography
A mathematical algorithm that takes plain text and changes it into cipher text, for security purposes.

6. Symmetric-Key Symmetric-key One strong algorithm
Two key must be kept secret.

7. Stream ciphers Keystream XOR operation Linear feedback
Nonlinear feedback
Stop-and-go generator
Shrinking generator

8. Block ciphers Fixed length Feistel cipher Rounding functions DES AES
Substitution-permutation network

9. Asymmetric Key aka Public key
William Joven
Diffie-hellman
RSA
MIT UK

10. Diffie Joven Hellman Logic Piano

11. Cryptanalysis, cypherpunks
Attacking cipher text
Two types
Professional and amateur
Weaknesses
Brute-force
Linear cryptanalysis
Differential cryptanalysis

12. Symmetric-asymmetric cryptography
Hybrid encryption
PGP, Pretty Good Privacy
OpenPGP

13. Encrypted Logons SSH Secure Shell RLogon Kerberos MIT Timestamps
Session key
Secret key
One-way Hash

14. Snake Oil for Sale
Snake Oil is a term used to describe commercial cryptographic methods and products which are considered bogus or fraudulent.

15. What to look for Secret systems Techno-Babble Larger bit claims
Cracking contests
Claims of setting new standards