Up & Down Cipher

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Alice wants to send a message to Bob over an insecure channel. Eve is the eavesdropper. Hence, Alice encrypts her message. The way she encrypts the plaintext is shown in the example below: Assumptions : Plaintext represents the original message. Ciphertext represents the encrypted message. The key is used to encrypt the plaintext. Consider $ \{ A = 0, B = 1, \cdots , Z = 25 \}$. There are no spac

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solution.cppC++17

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