return [key_matrix[i:i + 5] for i in range(0, 25, 5)] row1, col1 = find_position(pair[0], key_matrix) row2, col2 = find_position(pair[1], key_matrix) row1, col1 ...

This project demonstrates a Known Plaintext Attack (KPA) on a custom cipher that combines the Playfair and Hill ciphers. The goal is to recover the Hill key matrix and decrypt the ciphertext back to ...

Abstract: Cryptographic systems are either symmetric or asymmetric. Symmetric cryptographic systems use one common key for both encryption and decryption. Asymmetric cryptographic models use different ...