i$.$ Does this scheme offer mutual or one way authentication?Explain.

ii$.$ Would this scheme be appropriate for email service? Explain.

iii. Show how this scheme is secure against man$-$in$-$the middle attack.

iv$.$ Show how the scheme offers confidentiality.

b$)$ Kerberos involves three two$-$message exchanges, one between the client and the Key Distribution Center $($KDC$),$ one between the client and the Ticket Granting Service $($TGS$),$ and one between the client and the server $($S$)$ chosen by the client.

i$.$ Explain briefly, in general terms, the purpose of each of the three exchanges $($between the client and KDC$,$ client and TGS$,$ and client and S$).$

ii$.$ Assuming that the user's password is not stored on the client machine, how is communication between $\backslash ($ C $\backslash )$ and KDC secured?

iii. It is possible for an attacker to simply overhear a request and response for C from TGS$.$ Explain how this will not be helpful in accessing services offered by S $.$