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What will be the size of a key matrix if the plain text is “SECRET”?

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What will be the size of a key matrix if the plain text is “SECRET”?

(a) 1×6

(b) 5×1

(c) 6×1

(d) 6×6

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

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The correct answer is (d) 6×6

The best explanation: Hill cipher uses a n x n matrix in order to cipher the plain text. In this case n=6 so a 6×6 matrix will be used.

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