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What will be the plain text corresponding to cipher text “BPKYFS” if playfair cipher is used with keyword as “SECRET” (assuming j is combined with i)?

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What will be the plain text corresponding to cipher text “BPKYFS” if playfair cipher is used with keyword as “SECRET” (assuming j is combined with i)?

(a) INDIAN

(b) WORLD

(c) DOLLAR

(d) HELLO

The question was asked in an interview for job.

I'm obligated to ask this question of Cryptography in chapter Cryptography of Data Structures & Algorithms II

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Right answer is (c) DOLLAR

The explanation is: To decrypt the message we follow the reverse procedure. The table is formed in the same manner. Applying this we get the plain text to be “DOLLAR”.

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