Posted 23rd July 2017 by
Here is the answer to yesterday’s question. If you haven’t read it, make sure to read it first.
As promised, I will give you two different answers. The first method has a slight drawback in that each lock can be used only once. The second method avoids this problem by not sending any keys through the mail.
Posted 22nd July 2017 by
Alice wants to send a message to Bob in the mail. Unfortunately, Bob lives with Eve, and they share a letterbox. Bob doesn’t trust Eve when it comes to sniffing around in Bob’s mail. So Alice and Bob want to devise a method of sending the message in such a way that Eve will not be able to read the message.