8. Assue you know that 7amod 31 = 10. What is a?
9. Two individuals decide to use the Diffie-Hellman Key Exchange System to communicate a key. They agree that p=11 and s=8. One chooses private key 3 (a=3) and the other private key 4 (b=4). Verify that they each wind up with the same key.
10. One individual wants to send a message consisting of the single number 25 to another using the Massey-Omura System. Both agree on the prime p=31. The sender chooses two private keys: 13 and 7; the receiver chooses two private keys: 17 and 23. Verify that the receiver actually receives the number 25.