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What will be the plain text corresponding to cipher text “YGQ“ if hill cipher is used with keyword as “GYBNQKURP”?

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What will be the plain text corresponding to cipher text “YGQ“ if hill cipher is used with keyword as “GYBNQKURP”?

(a) SECRET

(b) WORLD

(c) DOLLAR

(d) HELLO

The question was posed to me during an interview.

My query is from Cryptography in section Cryptography of Data Structures & Algorithms II

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The correct answer is (a) SECRET

To explain: To decrypt the message we follow the reverse procedure. We first find the inverse of the keyword matrix then multiply it with cipher matrix.

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