Need help!! Cryptography

4. A substitution cipher encrypts abcde to HSDOR. How many possible keys are there that do that? 5. Describe a "modulo 10" version of the ADFGX cipher (the encryption and decryption procedure. Use the modulo-10 procedure to encrypt the string facebadge using the key ice. 6. Please be prepared to encrypt and decrypt by hand using Hill cipher with 2-by-2 matrices, modulo 10For example, if the Hill cipher key is M = encrypt the word egg; determine the decryption key; and verify that the decryption wl give the correct plaintext