Question: A general program to implement substitution (additive) cipher (encryption and decryption). The input to the program is a flag that demands encryption or decryption, the

A general program to implement substitution (additive) cipher (encryption and decryption). The input to the program is a flag that demands encryption or decryption, the symmetric key, and the plaintext or ciphertext. The output is the ciphertext or the plaintext, depending on the flag.

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