“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
“In this simplistic example we have to admit that the sender has no way of knowing whose padlock is on the briefcase and that… — 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… — Fred Piper Copy Share Image
