Question: Consider a multiplicative cipher defined by C = (P xk) mod 26 analogous to the generalized (additive) Caesar cipher. What is the encryption of

Consider a multiplicative cipher defined by C = (P xk) mod 26 analogous to the generalized (additive) Caesar cipher. What is the encryption of "goodby" using the key k = 7? What is the formula for decryption? How many different keys are possible? Explain.

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