MathCryptography

The basic ideas of cryptography

Sending integers

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Suppose Alice wants to send Bob an integer $m$ . They have previously chosen another integer $k$ as a key. What operations can possibly serve as an encryption function?

Hint: think about when Bob can recover the original message without any doubt.

Select one or more options from the list

m \cdot k

m + k

(m - k)^{2}

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