Composite Substitution Cipher

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Alice wants to send a message to Bob over an insecure channel. Eve is eavesdropper. Hence, Alice encrypts her message in the following way: Assumptions Plaintext represents the original message. Ciphertext represents the encrypted message. The keys are used to encrypt the plaintext. Consider $ \{ A = 0, B = 1, \cdots , Z = 25 \}$. There are no spaces, newlines or other punctuation symbols in plain

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solution.cppC++17

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