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What will be the plain text corresponding to cipher text “PROTO” if vigenere cipher is used with keyword as “HELLO”?

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What will be the plain text corresponding to cipher text “PROTO” if vigenere cipher is used with keyword as “HELLO”?

(a) SANFOUNDRY

(b) WORLD

(c) INDIA

(d) AMERICA

The question was asked by my college director while I was bunking the class.

My doubt is from Cryptography in section Cryptography of Data Structures & Algorithms II

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The correct option is (c) INDIA

Best explanation: Vigenere cipher is a type of poly alphabetic substitution which uses vigenere table for making substitutions in the plain text. Using the table we find the plain text to be “INDIA”.

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