Question

Running key cipher is a variation of?

(a) vigenere cipher

(b) autokey cipher

(c) hill cipher

(d) route cipher

This question was addressed to me in final exam.

I'd like to ask this question from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

Answer 1

Correct answer is (a) vigenere cipher

Best explanation: Vigenere cipher is a variation of vigenere cipher. The only difference between them is that in vigenere cipher a random key is chosen whereas in running key cipher key is chosen from a book or a text.