nPhase 2: C gets a Ticket for S
3.C requests a ticket to communicate with S from the
ticket-granting service (TGS)
nC sends TGT to S along with an
authenticator requesting a ticket from C to S
nC è TGS: {AC,S}KC,TGS , {TC,TGS}KTGS
nwhere Ac,s = {c, timestamp, opt. subkey}Kc,s
nFirst part proves to TGS that C
knows the session key
nSecond part is the TGT C got from
the KDC