Question

Which of the following cipher uses two keys to encrypt data?

(a) substitution cipher

(b) transposition cipher

(c) symmetric cipher

(d) asymmetric cipher

This question was addressed to me by my school principal while I was bunking the class.

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

Answer 1

Right choice is (d) asymmetric cipher

Easiest explanation - Asymmetric cipher makes use of 2 keys for the purpose of encryption. One is known as public key whereas other is called private key.