You want to send a secret two-character message, "HI", to your friend. You have ...
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You want to send a secret two-character message, "HI", to your friend. You have both agreed on a secret numerical key, which you will use only once.
- Plaintext Message: HI
- Secret Key (as numbers): [3, 15]
Show the step-by-step process of encrypting and decrypting this message using modular arithmetic (mod 26).
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