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In which of the following cipher the plain text and the ciphered text does not have same number of letters?

(a) affine cipher

(b) hill cipher

(c) columnar cipher

(d) additive cipher

I had been asked this question by my college director while I was bunking the class.

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

1 Answer

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The correct choice is (b) hill cipher

The best I can explain: In transposition cipher and mono alphabetic cipher the number of letters remains the same in ciphered and deciphered text. But in poly alphabetic cipher the number of letters are different. So here as hill cipher is the only poly alphabetic cipher so it will be the answer.

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