Question

In which of the following cipher the plain text and the ciphered text does not have a same number of letters?

(a) affine cipher

(b) vigenere cipher

(c) columnar cipher

(d) additive cipher

The question was asked by my school teacher while I was bunking the class.

Query is from Cryptography topic in division Cryptography of Data Structures & Algorithms II

Answer 1

Right choice is (b) vigenere cipher

Explanation: In transposition cipher and mono alphabetic cipher the number of letters remain same in ciphered and deciphered text. But in poly alphabetic cipher the number of letters are different. So here as vigenere cipher is the only poly alphabetic cipher so it will be the answer.