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A key matrix used for encryption in hill cipher must be?(a) invertible matrix(b) non invertible matrix(c) square matrix(d) rectangular matrixI got this question during an online exam.The above asked question is from Cryptography topic in portion Cryptography of Data Structures & Algorithms II

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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