Use this message:

(FOLLOW THE “WHAT” example above)

“UCUMBERLAND IS A+”

Fill the message in the 4X4 MATRIX

and NOW Multiply by the AES MIX ROW – IN GALOIS FIELD (Below)

2311

1231

1123

3112

Remember the 2 is actually is actually 0010 

3 is 0011

1 is 0001

YOU ARE PERFORMING MATRIX MULTIPLICATION (DOT PRODUCT) AND REDUCE IF NEEDED. THE RESULT HAS TO FIT IN ONE BYTE