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What key characteristic distinguishes a Hill cipher from other substitution ciphers? Select one: a . It replaces each letter with another letter based on a

What key characteristic distinguishes a Hill cipher from other substitution ciphers?
Select one:
a. It replaces each letter with another letter based on a pre-defined key word.
b. It shifts individual letters by a fixed number of positions in the alphabet.
c. It multiplies plaintext characters with a square matrix to produce ciphertext.
d. It relies on complex mathematical algorithms for encryption and decryption.

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