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A key matrix used for encryption in hill cipher must be?

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in Data Structures & Algorithms II by (80.7k points)
A key matrix used for encryption in hill cipher must be?

(a) invertible matrix

(b) non invertible matrix

(c) square matrix

(d) rectangular matrix

I got this question during an online exam.

The above asked question is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

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Best answer
The correct answer is (a) invertible matrix

Explanation: A key matrix used for encryption in hill cipher must be invertible matrix. Otherwise it will be impossible to decipher the message.

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