HP UX Kerberos Data Security Software manual Tgt

Principal	A unique name for a user or service stored in a KDC
Secret key	An encryption key shared by a principal and the KDC,
	distributed outside the bounds of the system, with a long
	lifetime. In the case of a user's principal, the secret key is
	derived from a password.
Service	A resource provided to network clients; often provided by
	more than one server (for example, remote file service).
Session key	A temporary encryption key used between two principals,
	with a lifetime limited to the duration of a single login
	session.
Ticket	A record that helps a client authenticate itself to a server; it
	contains the client's identity and other information all sealed
	using the server's secret key.
TGT	An initial ticket issued by the AS which is used to request
	additional tickets from the TGS for access to network
	services.

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XXXX-XXXXEN, 03/2005