1. In the discussion on the Mix Columns transformation, the i-th column was transformed by using: si r02 03 01 017 [So,i 01 02 03 01 S1,1 X 01 01 02 03 L03 01 01 02. S2, S3,i] Compute: ISO, s! T02 01 01 L03 03 02 01 01 01 01 03 01 02 03 01 02 09 OD LOB s2,1 [s3,i