Question: Calculate the key size (in bits) for the Hill cipher with a 29 letter alphabet and using (a) 2x2 matrices; (b) 3x3 matrices. I know

Calculate the key size (in bits) for the Hill cipher with a 29 letter alphabet and using (a) 2x2 matrices; (b) 3x3 matrices.

I know the answers are 19 bits and 44 bits, but I dont understand how they are calculated.

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