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And who is the man in the middle?

Mallory, the malicious man in the middle.

Aw, you beat me to it. I had a meeting to run to and didn't respond. But adding to that there is a whole wiki (of course there is) about this. https://en.wikipedia.org/wiki/Alice_and_Bob

Michael.

Oh wait, my apologies, he's the man in the mirror.

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