Question: a. Encrypt the message meet me at the usual place at ten rather than eight oclock using the Hill cipher with the key (left(begin{array}{ll}9 &

a. Encrypt the message "meet me at the usual place at ten rather than eight oclock" using the Hill cipher with the key $\left(\begin{array}{ll}9 & 4 \\ 5 & 7\end{array}ight)$. Show your calculations and the result.

b. Show the calculations for the corresponding decryption of the ciphertext to recover the original plaintext.

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a We need an even number of letters so append a q to the end of the message Then convert the letters ... View full answer

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