3. The first part of Kerberos between client A, Authentication server AS, and Ticket granting server (TGS) is as follows. 1. A ASA > 2. AS A : {KA,T GS, {KA,T GS, A}K }K 3. AT GS {KA,T GS, A}K, B, {t}K 4. TGS A {B, KAB}K, {A, KA,B}K i. Show the tickets, the authenticator and explain their functions. ii. What does the principal B represent? iii. Why is the time t sent in step 3 and why is it encrypted? s]