# CryptographyIntroAssignment

```Name: _________________________________
1. Use the Caesar cipher to encrypt the message RETREAT.
2. Decrypt the message KROG DW DOO FRVWV using the Caesar cipher.
3. Encrypt your own message using the Caesar cipher, providing both your original
message and the encrypted version.
4. Use the Vigen&egrave;re cipher with the key word HELP to encrypt the message PHONE
HOME.
5. Given that BEATLES was used as the key word to encrypt SSLETRY TXOGPW,
decrypt the message.
6. Use the Vigen&egrave;re cipher with the key word CLUE to encrypt the message THE
WALRUS WAS PAUL.
7. Choose a key word and then encrypt your own message using the Vigen&egrave;re cipher.
8. Suppose we code the four-symbol genetic set {A, C, T, G} into binary form:
A 0, C 10, T 110, G 111
Convert the sequence ACAAGTAAC into binary code.
9. Using the same code as in Exercise 8, determine the sequence of symbols represented
by the binary code 001100001111000.
10. Suppose we code a five-symbol set {A, B, C, D, E} into binary form as follows:
A 0, B 10, C 110, D 1110, E 1111.
Convert the sequence AEAADBAABCB into binary code. Determine the sequence
of symbols represented by the binary code 01000110100011111110.
```