Question: [ Stream ciphers are malleable ] Suppose that the message Pay $ 1 0 0 0 to Bob is encrypted using a stream cipher as

[Stream ciphers are malleable] Suppose that the message Pay $1000 to Bob is encrypted using
a stream cipher as 7e4d6c73d5240a948f86951bc29481a5(in hex). It is known that the plaintext
letters are encoded as 8-bit ASCII characters. Provide a modified ciphertext such that its decryption
would read Pay $9000 to Bob. Explain your answer.

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