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

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in Data Structures & Algorithms II by (80.7k points)
What will be the plain text corresponding to cipher text “KEPWSN” if running key cipher is used with keyword as “SANFOUNDRY”?

(a) SECRET

(b) QWERTY

(c) INDIAN

(d) FRIEND

I got this question in my homework.

Enquiry is from Cryptography in section Cryptography of Data Structures & Algorithms II

1 Answer

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The correct choice is (a) SECRET

Easiest 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 “SECRET”.

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