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ISRO | ISRO CS 2020 | Question 28

  • Last Updated : 04 Sep, 2020
Geek Week

In a columnar transposition cipher, the plain text is “the tomato is a plant in the night shade family”, keyword is “TOMATO”.

The cipher text is
(A) “TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX”
(B) “TINESAX / EOAHTFX / MAIIAIX / HTLTHEY / TAPNGDL / OSTNHMX”
(C) “TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / OSTNHMX / TAPNGDL”
(D) “EOAHTFX / TINESAX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX”


Answer: (A)

Explanation: According to Columnar Transposition Cipher :

Columnar Transposition involves writing the plaintext out in rows, and then reading the ciphertext off in columns one by one.

Hence, cipher text is,

TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX 

Option (A) is correct.

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