Polyalphabetic Cipher Multiple choice Questions and Answers (MCQs)

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Polyalphabetic Cipher Multiple choice Questions and Answers (MCQs)

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Question 1 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
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 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
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 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
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 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
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 [CLICK ON ANY CHOICE TO KNOW MCQ multiple objective type questions RIGHT ANSWER]
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
Question 5 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.

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