Question

What will be the plain text corresponding to cipher text “SFNUFACT” if with number of columns are given to be 3 and route of reading is from the bottom right anti clockwise?

(a) FACTSFUN

(b) FACTFUNS

(c) FUNSFACT

(d) FUNFACTS

I have been asked this question in an interview for internship.

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

Answer 1

Correct option is (d) FUNFACTS

The best explanation: For decryption we reverse the process used in encryption. So we arrange the letters of cipher text from bottom right anti clockwise and then read the grid horizontally.

F

U

N

F

A

C

T

S

So the resulting plain text is “FUNFACTS”.