Question: Alice ( A ) and Bob ( B ) exchange messages. a . What is happening in the following exchange? Describe each step. M is

Alice (A) and Bob (B) exchange messages.
a.What is happening in the following exchange? Describe each step. M is a message and n is a serial number.
(4 marks)
i.A -> B : R
ii.B -> A: {{M1}K, n1}K(B pr)
b.The serial number provides a guarantee of freshness. Name two other ways of guaranteeing freshness that Bob and Alice could have used

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