Outline for October 14, 2005

1. Codes and Ciphers
   1. Hiding information
   2. Plaintext, ciphertext, and keys
   3. Attacking codes and ciphers
   4. Difference between "code" and "cipher"
   5. Superencipherment
   6. Transposition ciphers
   7. Simple substitution cipher
   8. Vigenère cipher
   9. Running key cipher