July 29, 2009…
Continuing last lecture…
Focuses on cryptography substitution & transposition…
Some highlight we gain today…
Continuing last lecture…
Focuses on cryptography substitution & transposition…
Some highlight we gain today…
Transposition
- Use unkey and key technique:
i. Unkey single transposition – range based on column number
ii. Key single transposition – random number on column
- Encrypter must provide position of number and key combination
Substitution
- Vigenere cipher – use vigenere table...
- Contain: Caesar cipher & vigenere cipher