Question

Alice often needs to encipher plaintext made of both letters (a to z) and digits (0 to 9).

a. If she uses an additive cipher, what is the key domain? What is the modulus?

b. If she uses a multiplicative cipher, what is the key domain? What is the modulus?

c. If she uses an affine cipher, what is the key domain? What is the modulus?

Answer 1

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