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What will be the ciphered text corresponding to “SANFOUNDRY” if beaufort cipher is used for encryption with key as “KEY”?

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What will be the ciphered text corresponding to “SANFOUNDRY” if beaufort cipher is used for encryption with key as “KEY”?

(a) SBPISZTKZH

(b) TCQJTAULAI

(c) SELFQEXBHM

(d) SPBISZKTZH

This question was addressed to me in an interview for internship.

Question is from Cryptography topic in division Cryptography of Data Structures & Algorithms II

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The correct answer is (c) SELFQEXBHM

For explanation: For encrypting plain text choose the first letter of plain text (i.e. S) in the first horizontal row. Then find the first letter of key (i.e. K) in the column obtained in the first step. Finally, choose the leftmost letter of the row (i.e. S) obtained in the previous step. So the corresponding cipher text is “SELFQEXBHM”.

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