(c) Encrypt the message 'IRABPISL' using the Hill cipher with the key matrix $K = \begin{bmatrix} 7 & 5 \\ 4 & 9 \end{bmatrix}$ (mod 26). Write the decryption function.
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.., Z=25. The message 'IRABPISL' can be converted to the numbers [8, 17, 0, 1, 15, 8, 18, 11]. Show more…
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