Assignment Task
Question 1 – Authentication Protocols Consider the following 4-message protocol:
1. A → S: (B, {(A, K1)}KpbS)
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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 the protocol, 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’s identity
b) Both A and B establish a session key K1, and B is sure of A’s identity
c) Both A and B establish a session key K1, and A is sure of B’s identity
d) Both A and B establish a session key K1, and both B and A are sure of each other’s identity
e) Both A and B establish a session key K2, and A is sure of B’s identity
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’s identities
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
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