Cryptography2082Numerical: Hill cipher decryptionSubstitution Techniques
Decrypt the ciphertext 'HI' using Hill Cipher where the key is. Ciphertext: HI, Key:
Decrypt the ciphertext 'HI' using Hill Cipher where the key is. Ciphertext: HI, Key: $$\begin{bmatrix} 5 & 3 \ 4 & 3 \end{bmatrix}$$
- Ciphertext: HI - Key Matrix: $$K = \begin{bmatrix} 5 & 3 \ 4 & 3 \end{bmatrix}$$ - Alphabet mapping: A=0, B=1, ..., Z=25, modulus 26. --- - H = 7 - I = 8 $$C = \begin{bmatrix} 7 \ 8 \end{bmatrix}$$ --- $$P = K^{-1} C \pmod{26}$$ --- $$\det(K) = (5)(3) - (3)(4) = 15 - 12 = 3$$ --- $$3 \cdot d^...