Question: An even trickier question: In a three - message authentication protocol, Alice initiates contact with Bob. Bob is a stateless server, and thus it is

An even trickier question: In a three-message authentication protocol, Alice initiates
contact with Bob. Bob is a stateless server, and thus it is inconvenient for him to
remember the challenges sent to Alice. Assume that Alice and Bob share a key KAlice-
Bob and Bob also has a key KBob only known to himself. The protocol works as follows,
where R1 and R2 are random numbers generated by Alice and Bob, respectively

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