1. Permutations and Ciphers
By: Hani, Joe Gamble, Russel, and Andrew

2. Permutations Both parties agree on an order with serves as the key.
Ex:635241
The key is used to encode n-letter blocks where n is the length of the key.
Using the above example n=6
The receiver reverses the encode to decrypt the message.

3. Examples Key: Plain text: 1 2 3 4 5 6 7 8 9 10
Ciphertext: 2 4  6    3  5  7  9
Encryption:
CRYPTOLOGY
RPOOYCYTLG
Decryption:
SICASCC  LS
CSCI CLASS

4. Examples (cont.) key: x 1 2 3 4 5 6 7 8 9 10 p(x) 8 5 9 6 1 10 3 7 2 4
Plain: abcdefghij klmnopqrst uvwxyzzzzz (extra z's used as padding)
Cipher: heifajcgbd rospktmqln zyzzuzwzvx
Plain: its bad luck to be superstitious
Plain: itsbadluck tobesupers titiouszzz  (extra z's used as padding)
Cipher: uacdiksltb esrutsbpoe zozutztsii