Question

Autokey cipher is closely related to ___________

(a) Vigenere cipher

(b) Hill cipher

(c) Play fair cipher

(d) Rotor cipher

This question was addressed to me in unit test.

This intriguing question comes from Cryptography in portion Cryptography of Data Structures & Algorithms II

Answer 1

Correct option is (a) Vigenere cipher

The best explanation: Autokey cipher like vigenere cipher uses vigenere table in order to encrypt the plain text. The difference in these cipher is the usage of the keyword.