Question

What will be the encrypted text corresponding to plain text “SANFOUNDRY” using columnar transposition cipher with the keyword as “GAMES”?

(a) SNONRAFUDY

(b) SORAFUDYNN

(c) SNAUDNORFY

(d) ANFRSUNDOY

The question was asked in examination.

My question is from Cryptography in division Cryptography of Data Structures & Algorithms II

Answer 1

Correct answer is (d) ANFRSUNDOY

The best explanation: For encrypting using columnar cipher we have to arrange the letters of the plain text in a table which has the same number of columns as the letters of the keyword. Then the letters of the keyword are arranged in alphabetical order and we read along each column.

3 1 4 2 5

G A M E S

S A N F O

U N D R Y

So the ciphered text will be “ANFRSUNDOY”.