Question: 3) (Review) Classical Cryptography: Using the Hill cipher for an 26 letter alphabet: 0,1,2,....25, where the plain text is represented by a vector [1 3

3) (Review) Classical Cryptography: Using the Hill cipher for an 26 letter alphabet: 0,1,2,....25, where the plain text is represented by a vector [1 3 19]: a. Design your own 3 by 3 key K and then find K'l. Do not use any keys that has been used in this course such as the one shown below. Every student should have a different key. Any duplicated key will result a 0 (40 points): 17 17 5 K=21 18 21 2 2 19 b. Using the designed key from part a to encrypt the plaintext. (5 points): c. Now use the computed ciphertext in part b to decrypt and restore the plaintext. (5 points)

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