A SERVICE OF

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Overview
Authentication Process
Chapter 130
also verifies that the user’s service ticket has not expired. If the user does
not have a valid service ticket, then the server will return an appropriate
error code to the client.
Step 7. (Optional) At the client’s request, the application server can also return
the timestamp sent by the client, encrypted in the session key. This
ensures a mutual authentication between the client and the server.