Question 5 (15 points)

To prevent man-in-the-middle attack against Diffie-Hellman protocol, _____ has to be added.

Question 5 options:

	Authentication
	One time pad
	A Nonce
	None of the above

Question 6 (15 points)

How to prevent Denning-Sato attack?

Question 6 options:

	Adding a nonce
	Having a shared key
	Adding a certficate
	None of the above

Question 7 (15 points)

In X.509v3 certificate, which field would not be present?

Question 7 options:

	validity period
	issuer name
	serial number
	IP address of the server