Question

Bifid cipher combines transposition with which of the following cipher?

(a) Polybius square cipher

(b) Playfair cipher

(c) gronsfeld cipher

(d) trifid cipher

This question was posed to me in final exam.

This is a very interesting question from Cryptography in division Cryptography of Data Structures & Algorithms II

Answer 1

Correct answer is (a) Polybius square cipher

The best explanation: Bifid cipher combines polybius square cipher with transposition. It uses fractionation to obtain diffusion.