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What will be the plain text corresponding to cipher text “IWRWHS” if running key cipher is used with keyword as “SANFOUNDRY”?

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What will be the plain text corresponding to cipher text “IWRWHS” if running key cipher is used with keyword as “SANFOUNDRY”?

(a) SECRET

(b) QWERTY

(c) INDIAN

(d) FRIEND

I got this question during an online interview.

Origin of the question is Cryptography in portion Cryptography of Data Structures & Algorithms II

1 Answer

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Best answer
Right choice is (b) QWERTY

Easy explanation - Running key cipher is a type of poly alphabetic substitution which uses tabula recta for making substitutions in the plain text. Using the table we find the plain text to be “QWERTY”.

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