POSITIONAL_SUBSTITUTION

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Vivek wants to send a secret message to Mohan over an insecure channel by encrypting it so that no hacker may eavesdrop. **Assumptions:** $P$ is the plaintext which represents the original message. Plaintext letters are all in upper case without any punctuation and whitespaces. $W$ is the key string that is used to encrypt the plaintext. $C$ is the ciphertext which represents the encrypted mes

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solution.cppC++17

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