“In this simplistic example we have to admit that the sender has no way of knowing whose padlock is on the briefcase and that it might be possible for an adversary to impersonate the receiver and place their padlock on… — Fred Piper Copy Share Image
“Step 1: The sender places the present in the briefcase, which they lock with their padlock and remove their key. They then send the locked briefcase to the receiver. Note: While the briefcase is en route from sender to receiver,… — Fred Piper Copy Share Image
