# Polyalphabetic Cipher Multiple choice Questions and Answers (MCQs)

## Click on any option to know the CORRECT ANSWERS

 Question 1
What is the meaning of cipher in cryptography?
 A an algorithm that performs encryption B an algorithm that generates a secret code C an algorithm that performs encryption or decryption D a secret code

Question 1 Explanation:
Cipher is an algorithm for performing encryption or decryption. In cryptography, a set of defined steps are followed to generate ciphers. These are necessary to prevent data breach.

 Question 2
Which of the following ciphers are created by shuffling the letters of a word?
 A rotor cipher B rail fence cipher C vigenere cipher D hill cipher

Question 2 Explanation:
There are two types of traditional ciphers- Transposition and substitution cipher. In transposition cipher the letters of the given data are shuffled in a particular order, fixed by a given rule. Rail fence cipher is an example of transposition cipher.

 Question 3
Which of the following is a type of substitution cipher?
 A poly alphabetic cipher B transposition cipher C columnar cipher D rail fence cipher

Question 3 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.

 Question 4
Which of the following correctly defines poly alphabetic cipher?
 A a substitution based cipher which uses multiple substitution at different positions B a substitution based cipher which uses fixed substitution over entire message C a transposition based cipher which uses multiple substitution at different positions D a transposition based cipher which uses fixed substitution over entire message

Question 4 Explanation:
Poly alphabetic cipher is a type of substitution cipher. It uses multiple substitution at different positions in order to cipher the plain text.

 Question 5
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