5. (10 points) Consider a desktop publishing system used to produce documents for various (a) Give an example of a type of publication for which confidentiality of the stored data is the most important requirement. (b) Give an example of a type of publication in which data integrity is the most important requirement (c) Give an example in which system availability is the most important requirement. 10. (20 points) (a) Encrypt the message "meet me at the usual place at ten rather than eight oclock q" using the Hill cipher with the key Show your calculations and the result. 5 12 (b) The inverse matrix of the key is 15 25 mod 26. Show the calculations for the corresponding decryption of the ciphertext to recover the original plaintext