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While choosing the value of a and m (m is the no. of alphabets) in affine cipher it must be ensured that?

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in Data Structures & Algorithms II by (80.7k points)
While choosing the value of a and m (m is the no. of alphabets) in affine cipher it must be ensured that?

(a) a and m are prime numbers

(b) a and m are odd numbers

(c) a and m are coprime

(d) a and m are even numbers

This question was posed to me during an interview.

The question is from Cryptography topic in section Cryptography of Data Structures & Algorithms II

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Correct option is (c) a and m are coprime

For explanation: While choosing the values of a and m it should be ensured that a and m are coprime. Otherwise decoding the ciphered text would be difficult.

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