Authentication Protocols - Science Assignment Help

Assignment Task

Question 1 - Authentication Protocols 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 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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