Tag: mail

A Secret Message: Answer

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.

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A Secret Message

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.

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