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3. (a) The ciphertext ITFO was encrypted by a Hill cipher with a 2 x 2 matrix. The plaintext is dont. Find the encryption matrix.

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3. (a) The ciphertext ITFO was encrypted by a Hill cipher with a 2 x 2 matrix. The plaintext is dont. Find the encryption matrix. (b) Suppose the ciphertext is ITFE and the plaintext is still dont. Find the encryption matrix. Note that the second column of the matrix is changed. What does it mean? Is it a good or a bad property of a cipher. Discuss

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