Question

Which of the following is a type of substitution cipher?

(a) poly alphabetic cipher

(b) transposition cipher

(c) columnar cipher

(d) rail fence cipher

I got this question at a job interview.

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

Answer 1

Correct option is (a) poly alphabetic cipher

Easiest explanation - In substitution cipher the plain text is replaced by cipher text according to a fixed rule. There are two types of substitution cipher- Mono alphabetic and Poly alphabetic cipher.