This question is about Kerberos Version $4$ from Table $15\mathrm{.}1.$ Give explanations for the following:

$($a$)$ Suppose BG captures $(4)$ i$.$e$.$ the communication from T GS to C$.$ Will he be able to pose as C and get service

from V $?$

$($b$)$ Explain what would be the disadvantage if the lifetime in the service$-$granting ticket was very long and what would

be the disadvantage if the lifetime was very short.

$($c$)$ Suppose V is a file server and C wants to get files from V $.$ One purpose of sending KC$,$V in round $(4)$ is that

V can encrypt files using KC$,$V to mantain confidentiality. Suppose C does not care about the confidentiality of

these files i$.$e$.$ he does not care if BG is able to read these files. In this situation, the files do not need to be

encrypted with KC$,$V $.$ In this situation, does KC$,$V still need to be included in round $(4)?$ Give a YES$/$NO answer

and then briefly explain your answer. Give a YES$/$NO answer and then briefly explain your answer.