prim number is divided by itself or 1
relativley prime
modualar
find the additive inverse 22 mod 47
find the additive inverse 12 mod 100
multiplicative inverse of
9 mod (10)
17 mod (23)
Homework:
from the net research: ECB electronic code book - CBC - one round of DES - RSA
Tuesday, July 31, 2007
Tuesday, July 24, 2007
class excersie
Vigenere cipher
the gold is buried under the plane tree
6-9-12-15-22
A B C D EFGHIJKLMNOPQRSTUVWXYZ
the gold is buried under the plane tree
6-9-12-15-22
A B C D EFGHIJKLMNOPQRSTUVWXYZ
Class notes
Security in IT Network:
- response
- eduction
- authentication
- non-repudution
- disastor recovery
- threats
- attacks
- integrity
- firewall
- policy
- risk management
- physical security
type of cryptography:
Classic Cryptography
- Transpositions
- Double Transpositions
- Pig-Latin
- Grille
- Vigenere (taken in the class)
- Caesar Substitution (taken in the class)
- Atbash
- Playfair
- Bifid
Monoalphabetic Substitution (taken in the class)
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