Ex1. Alice has agreed with Bob on p=29 and n=11 to use in DH-KAP.

1. Confirm that n is primitive modulo p.
2. If Alice's secret exponent is a=19 and she received n\(^b=12(mod p)\) from Bob then:
   1. Compute n\(^a(mod p)\) that she sent to Bob.
   2. Compute their agreed secret key K\(_{ab}\).