Question

What will be the encrypted text corresponding to plain text “SANFOUNDRY” using rail fence cipher with key value given to be 2?

(a) SNONRAFUDY

(b) SORAFUDYNN

(c) SNAUDNORFY

(d) SANFOUNDRY

The question was posed to me by my school teacher while I was bunking the class.

This key question is from Cryptography in portion Cryptography of Data Structures & Algorithms II

Answer 1

Correct choice is (a) SNONRAFUDY

Easy explanation - For encrypting a plain text using rail fence cipher we use a table having a number of rows equal to key value as shown below. Then we read along the rows to get the ciphered text. So the ciphered text will be “SNONRAFUDY”.