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What will be the ciphered text corresponding to “ALGORITHM” if bifid cipher is used for encryption with key as “KEY” with a period as 5?

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What will be the ciphered text corresponding to “ALGORITHM” if bifid cipher is used for encryption with key as “KEY” with a period as 5?

(a) SBPISZTKZH

(b) PLNSOWGKQM

(c) SELFQEXBHM

(d) YFSGWNFBW

The question was posed to me during an online exam.

Query is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

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The correct answer is (d) YFSGWNFBW

Explanation: For encrypting the plain text using bifid cipher we first form the polybius square with the help of given key. After this, the plain text is divided into blocks of length 5 and corresponding coordinates are noted. So the corresponding cipher text would be “YFSGWNFBW”.

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