We use the following abbreviations : AS = Authentication Server SS = Service Server TGS = Ticket-Granting Server TGT = Ticket-Granting Ticket The client authenticates to the AS once using a long-term shared secret -LRB- e.g. a password -RRB- and receives a TGT from the AS .

Briefly , the client authenticates to AS using a long-term shared secret and receives a ticket from the AS .
