Question

What will be the ciphered text corresponding to “SANFOUNDRY” if gronsfeld cipher is used for encryption with key as “1234”?

(a) TCQJPWQHSA

(b) TCQJTAULAI

(c) TCQJOUNDRY

(d) UETNQYTLTC

This question was addressed to me by my college professor while I was bunking the class.

The origin of the question is Cryptography topic in portion Cryptography of Data Structures & Algorithms II

Answer 1

The correct choice is (a) TCQJPWQHSA

The best I can explain: Encryption in gronsfeld cipher takes place by shifting the letters of the plain text by a number given by the numeric key. So by applying this method, we get the ciphered text to be “TCQJPWQHSA”.