Problem 1: (35 points)
Decrypt the message: KGYXSH, which was encrypted
using the key matrix
A
| 3 | 8 |
| 7 | 11 |
Problem 2 (35 points)
Decrypt the message JLJI that was encrypted by Vigenere cipher first, with the key
DOG and after
that by Hill Cipher with the key matrix A
| 5 | 11 |
| 7 | 8 |
Problem 3 (30 points):
Encrypt: HEBREW using Vigenere Cipher with key GUY and then encrypt the obtained ciphertext using Hill Cipher
and the matrix from Problem 1.