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ISRO2020-44

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In a columnar transportation cipher, the plain text is “the tomato is a plant in the night shade family”, keyword is “$\text{TOMATO}$”. The cipher text is

  1. $\text{”TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX”}$
  2. $\text{”TINESAX / EOAHTFX / MAIIAIX / HTLTHEY / TAPNGDL / OSTNHMX”}$
  3. $\text{”TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / OSTNHMX / TAPNGDL”}$
  4. $\text{”EOAHTFX / TINESAX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX”}$
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Option A) is correct answer

In columnar transposition Cipher we writes the plaintext in rows and then reads the cipher text in columns one by one. 

 

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Starting with the column headed by "A", our ciphertext begins "TINESAX" from this column. We now move to the column headed by "M", and so on through the letters of the keyword in alphabetical order to get the ciphertext "TINESAX / EOAHTFX / HTLTHEY / MAIIAIX / TAPNGDL / OSTNHMX" (where the / tells you where a new column starts). The final ciphertext is thus "TINES AXEOA HTFXH TLTHE YMAII AIXTA PNGDL OSTNH MX".

 

https://crypto.interactive-maths.com/columnar-transposition-cipher.html

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