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What will be the ciphered text if the string “SANFOUNDRY” is given as input to the code of vigenere cipher with keyword as “HELLO”?

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What will be the ciphered text if the string “SANFOUNDRY” is given as input to the code of vigenere cipher with keyword as “HELLO”?

(a) UEWIIDKLL

(b) ZEYQCOCM

(c) ZEYQCBROCM

(d) ZEYQCBROCMJDH

This question was addressed to me in unit test.

This interesting question is from Cryptography in section Cryptography of Data Structures & Algorithms II

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Best answer
Correct choice is (c) ZEYQCBROCM

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 solution to be ZEYQCBROCM.

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