Question: Q2. (15 pts) Use Hill cipher- with size 2 block to encrypt and decrypt back the message message FA, if the key matrix 4 K=

Q2. (15 pts) Use Hill cipher- with size 2 block to

Q2. (15 pts) Use Hill cipher- with size 2 block to encrypt and decrypt back the message message FA, if the key matrix 4 K= 1 =(1 3) and the 26-element alphabet is coded as follows: b c d e f g h i j k l m n o a pa r s t u V W Z 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 N=26 Check existance of the inverse key matrix and find it. Show your calculations give necessary explanations

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