The Kerberos Authentication Server might reject an AS_REQ message and instead require pre-authentication - that is, it requires the client to send a timestamp encrypted with the client key. Why does it do this? Select one: a. It must not disclose the Ticket Granting Ticket before the client has authenticated b. It is dangerous to respond to an AS_REQ message before the client has authenticated c. Responding to multiple AS_REQ messages would allow a guessed plaintext attack d. It needs the client's public key to check the pre-authentication message was signed correctly

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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The Kerberos Authentication Server might reject an AS_REQ message and instead require pre-authentication - that is, it requires the client to send a timestamp encrypted with the client key. Why does it do this?

Select one:
a. It must not disclose the Ticket Granting Ticket before the client has authenticated
b. It is dangerous to respond to an AS_REQ message before the client has authenticated
c. Responding to multiple AS_REQ messages would allow a guessed plaintext attack
d. It needs the client's public key to check the pre-authentication message was signed correctly
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