Question

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

(a) vigenere cipher

(b) one time pad cipher

(c) play fair cipher

(d) pigpen cipher

I had been asked this question in an online interview.

I'm obligated to ask this question of Cryptography topic in chapter Cryptography of Data Structures & Algorithms II

Answer 1

Right choice is (d) pigpen cipher

The best I can explain: Pigpen cipher is the only non poly alphabetic substitution cipher out of the given options. It is an example of geometric substitution cipher.