Question

Which of the following cipher uses polybius square?

(a) bifid cipher

(b) beaufort cipher

(c) trithemius cipher

(d) gronsfeld cipher

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

Enquiry is from Cryptography in portion Cryptography of Data Structures & Algorithms II

Answer 1

The correct answer is (a) bifid cipher

Easiest explanation - Bifid cipher uses polybius square for encrypting the plain text. Bifid cipher combines polybius square cipher with transposition.