4 ms·If all I needed was detection I could just XOR all letters and append the result.by DenisM 7y agoIf all I needed was detection I could just XOR all letters and append the result.dexen 7y agoThis doesn't detect a transposition error, which is somewhat common with humans. That's why in EAN-13 and similar codes, the checksum takes digits with varying weights.DenisM 7y agodoh. tank you!