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Problem 2 (1 point). If we use mod 27 instead of mod 26 in Hill Cipher, if the determinant of a matrix is 9, can

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Problem 2 (1 point). If we use mod 27 instead of mod 26 in Hill Cipher, if the determinant of a matrix is 9, can we use this matrix as a key? If yes (or no), please explain the reason. Problem 3 (1 point). Please describe the steps in a Feistel function (or F function) which is used in each round of DES

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