Answer Happy

Question 28 (5 points) Saved Choose all the valid ways to defend against the Man-in-the-Middle attack. (first think about why do we say the Diffie-Hellman key exchange protocol is vulnerable to the Man-in-the-middle attack) Alice and Bob each sign their public numbers using their own private key, assuming the existence of a PKI Alice and Bob execute a challenge response authentication protocol using the derived shared key from Diffie Hellman protocol, to confirm that each other has derived the same key. User a larger modulus p Alice and Bob hash their finally derived shared key from Diffie Hellman protocol and send the hash to each other over an insecure channel. Post the public numbers in a trusted place, such as a secure website or a public ledger like blockchain Encrypt the public numbers using a pre-shared long term key between Alice and Bob.