Question

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

(a) route cipher

(b) columnar transposition cipher

(c) myszkowski cipher

(d) additive cipher

This question was posed to me by my school teacher while I was bunking the class.

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

Answer 1

The correct option is (d) additive cipher

To explain: In transposition cipher, the letters remain the same in ciphered and plain text. Their position is only changed whereas in substitution cipher the letters become different in encrypted text. As additive cipher is the only non transposition cipher out of the given options so it will be the correct option.