Consider the following 4-message protocol: 1. A→S: (B, {(A, K1)}KpbS) 2. S→B: A 3. B→S: (A, {(B, K2)}KpbS) 4. S→A: (B, {

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Consider the following 4-message protocol:
1. A→S: (B, {(A, K1)}KpbS)
2. S→B: A
3. B→S: (A, {(B, K2)}KpbS)
4. S→A: (B, {K2}K1)
Which one of the following statements is true, at the end of theprotocol, and with regards to the purpose of the protocol:
a) Both A and B establish a session key K2, and B is sure of A’sidentity
b) Both A and B establish a session key K1, and B is sure of A’sidentity
c) Both A and B establish a session key K1, and A is sure of B’sidentity
d) Both A and B establish a session key K1, and both B and A aresure of each other’s identity
e) Both A and B establish a session key K2, and A is sure of B’sidentity
f) Both A and B establish a session key K1
g) Both A and B establish a session key K2
h) Both A and B authenticate each other by knowing each other’sidentities
i) A ends up knowing B’s identity
j) B ends up knowing A’s identity
k) None of the above
l) All of the above