Signing your name. Suppose you get a message that claims to be coming from your friend Joseph Shlock. It says that you should invest all your savings in pork kidneys. How do you know if the message really came from your friend Shlock and not your arch-enemy Irving Satan? Ideally, it would be great if each message were “signed” by the sender in such a manner that no one could “forge” the signature. Using the RSA scheme (in reverse), devise a method for verifying a message’s origin. (Hint: Could the encoding procedure be used to reveal the signature?)
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The Heart of Mathematics: An Invitation to Effective Thinking
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