stream cipher encryption and decryption

Write computer programs to simulate a stream cipher that consists of both encryption and decryption. The encryption program accepts inputs from an existing text file, called “message.txt.” The encryption program produces an output ciphertext file, called “toyou”. The decryprion program takes “toyou” as input and decrypts it into original plaintext. (Hint: the random “seed” must be known, but be kept secure, by the pseudorandom number generators in both encryption and decryption programs.)

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