3 10 20 5. Consider the key matrix A = | 20 9 17 9 4 17 Encode the message BUY TEN SHARES TOMORROW using this key matrix. Note that you will need to insert a random letter X at the end of the message to make the number of letters a multiple of three. 6. Decode the message KSKBHXKDYRVTKRZTQE which was encoded using the key matix A from Question 5 3 10 20 5. Consider the key matrix A = | 20 9 17 9 4 17 Encode the message BUY TEN SHARES TOMORROW using this key matrix. Note that you will need to insert a random letter X at the end of the message to make the number of letters a multiple of three. 6. Decode the message KSKBHXKDYRVTKRZTQE which was encoded using the key matix A from Question 5