Question: Let consider the following protocol Anna has a 128-bit random string b Tom wants to prove that he knows b Tom sends a 128-bit string

Let consider the following protocol

  • Anna has a 128-bit random string b
  • Tom wants to prove that he knows b
  • Tom sends a 128-bit string b' to Anna
  • Anna accepts if b = b', otherwise reject

Is this an interactive proof?

1: No, because it is not complete

2: No, because it is not sound

3: No, because the proof cannot be verified in polynomial time

4: Yes it is.

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