ISRO | ISRO CS 2011 | Question 18

An example of poly-alphabetic substitution is
(A) P-box
(B) S-box
(C) Caesar cipher
(D) Vigenere cipher

Answer: (D)
Explanation: Using more than one alphabet and switching between them systematically to encrypt data is called a polyalphabetic substitution cipher. The Vigenere cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword. It is a form of polyalphabetic substitution.

So, option (D) is correct.
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