In which I talk about how to solve the problem of communication between two entities (I talk about the archetypal Alice and Bob) so that no one else (notably, Eve) can listen in, and no one (especially Mallory) can monkey around pretending to be Alice to Bob or vice versa. (For those not in the know why these names were chosen, Alice and Bob just designate A and B, Eve is the eavesdropper and Mallory the man-in-the-middle.) […]
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