Question: In class, we discussed challenge/response-based authentication using timestamp: Alice rightarrow Bob: I am Alice, E_k(timestamp) This protocol assumes that Alice and Bob already have a

In class, we discussed challenge/response-based authentication using timestamp: Alice rightarrow Bob:

In class, we discussed challenge/response-based authentication using timestamp: Alice rightarrow Bob: I am Alice, E_k(timestamp) This protocol assumes that Alice and Bob already have a shared secret key k. What is the key requirement to use this protocol for authentication

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