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) AMERICAThe 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

What will be the plain text corresponding to cipher text “PROTO” i

1.	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) AMERICAThe 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
Answer» 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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