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A ticket granting server (TGS) is a logical key distribution center (KDC) component that is used by the Kerberos protocol as a trusted third party. A TGS validates the use of a ticket for a specified purpose, such as network service access.
Kerberos uses the following TGS subprotocols:
Validated TGS tickets are used on different servers by respective client applications. A new service ticket is obtained by providing the TGS with the target service name, initial ticket and authenticator. The TGS compares data to build a new service ticket and generates a random session key. Finally, this data is encrypted and returned to the client as a new service authorization.