We assume that Alice has Bob's authentic public key . The following is an authentication protocol using public key encryption techniques.
Bob Alice : Hi, I am Bob
Alice Bob :
Bob Alice :
Here is a time-variant parameter and denotes a public key encryption function using key .
Which is the message (and the correct reason) that authenticates Bob to Alice?

Question

We assume that Alice has Bob's authentic public key . The following is an authentication protocol using public key encryption techniques.

Here is a time-variant parameter and denotes a public key encryption function using key .

Which is the message (and the correct reason) that authenticates Bob to Alice?

Accepted Answer

Message 3 - here Bob authenticates himself to Alice by proving that he knows the private key corresponding to his claimed public key   .

Answer

Message 1- here Bob authenticates himself to Alice by claiming that he is Bob.

Answer

Message 2 - here Bob authenticates himself to Alice by having the public key    .

Answer

None of them - Bob does not authenticate himself to Alice.

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