Question

Vigenere cipher is harder to crack than autokey cipher.

(a) true

(b) false

The question was posed to me during an online exam.

Origin of the question is Cryptography topic in section Cryptography of Data Structures & Algorithms II

Answer 1

Correct answer is (b) false

Best explanation: Autokey cipher is harder to crack than vigenere cipher. It is because in autokey cipher the key is formed using the plain text itself whereas in vigenere cipher the key is independent of the plain text. This makes autokey cipher more secure.