Suppose the message IZFORVKGRWVXMJJMUBLOVGXHOKE is intercepted and the following is known about it: a. the first three letters of the hidden message are DEM and the last three are LES b. the key matrix is ​​of the form (image) c. The determinant of the key matrix is ​​1 From the information: Write a system of equations that allows you to find the unknowns a, b, c and using the key matrix decrypt the hidden message.

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