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What will be the plain text corresponding to cipher text “ZEYQC” if autokey cipher is used with keyword as “SANFOUNDRY”?

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What will be the plain text corresponding to cipher text “ZEYQC” if autokey cipher is used with keyword as “SANFOUNDRY”?

(a) INDIA

(b) WORLD

(c) HELLO

(d) SECRET

I have been asked this question by my school teacher while I was bunking the class.

The above asked question is from Cryptography topic in chapter Cryptography of Data Structures & Algorithms II

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Correct option is (c) HELLO

The best explanation: Autokey cipher is a type of poly alphabetic substitution which uses vigenere table for making substitutions in the plain text after generating key using plain text. Using the table we find the plain text to be “HELLO”.

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