# To emphasize traditional symmetric-key substitution ciphers.

> To illustrate some monoalphabetic ciphers:

- Additive cipher
- Shift and Caesar cipher
- Multiplicative cipher
- Affine cipher

> To illustrate some polyalphabetic ciphers:

- Autokey cipher
- Playfair cipher
- Vigenere cipher
- One-time Pad
- Hill cipher.




# To illustrate some transposition ciphers:

- Keyless cipher
- Keyed cipher
- Columnar cipher.

> To differentiate between traditional and modern symmetric-key ciphers.

> To illustrate DES as a modern symmetric-key cipher.

> To illustrate RSA as a modern asymmetric-key cipher.