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Consider the following authentication protocol. R is the challenge sent by Bob to Alice, and KAB is the secret Alice and Bob share. Which of

Consider the following authentication protocol. R is the challenge sent by Bob to Alice, and KAB is the secret Alice and Bob share. Which of the following are secure for a session key? When answering this question, for each option, think about the three aspects:
a. Can Trudy impersonate Alice to Bob?
b. Can this session key be securely used to encrypt messages exchanged between Alice and Bob?
c. If this session key happened to be known by Trudy, can Trudy find KAB?
To get full credit, for the options that are not secure, briefly explain why it is not secure, you can explain by giving a case where an attacker can compromise the communication.
d. KAB XOR R
e.{ KAB + R} KAB
f.{R}R+ KAB
g.{ KAB } KAB
h.{R} KAB
i.{ KAB }R
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