Question

Which of the following is hardest to break using frequency analysis?

(a) Vigenere cipher

(b) Hill cipher

(c) Caesar cipher

(d) Affine cipher

This question was posed to me in an internship interview.

My question is based upon Cryptography in chapter Cryptography of Data Structures & Algorithms II

Answer 1

Right choice is (b) Hill cipher

Easy explanation - Out of the given options hill cipher is the hardest cipher to break using frequency analysis. Although it is quite vulnerable to other forms of attack.