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Any information exchange must go through a medium and it's not possible to create one with zero metadata.

• drdaeman 4y ago
  Oh, I think I see your point now. But I think it's a weird argument, to be honest. I suppose the fact that it's Peggy and Victor who are running that protocol is simply irrelevant. They're talking about that value of x after all, and nothing related to that topic is revealed beyond the proof of the fact that Peggy knows it. If she'd appear in person, wherever she wears a red shirt or a white one would be might be considered "information" but it would be completely out of scope.