Concept explainers
Top secret (ExH). In our discussion, the two public numbers 7 and 143 were given. How would you encode the message “4”? The secret decoding number is 103. Without performing the calculation (unless you have a computer that can do modular arithmetic for you), how would you decode the encrypted message you just made if you were the receiver?
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The Heart of Mathematics: An Invitation to Effective Thinking
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