Question

Which of the following is not a type of poly alphabetic cipher?

(a) Rotor cipher

(b) Hill cipher

(c) One time pad cipher

(d) Affine cipher

I had been asked this question in unit test.

This question is from Cryptography topic in chapter Cryptography of Data Structures & Algorithms II

Answer 1

Right answer is (d) Affine cipher

Easiest explanation - In poly alphabetic cipher each symbol of plain text is replaced by a different cipher text regardless of its occurrence. Out of the given options, only affine cipher is not a poly alphabetic cipher.