![]() Some symbologies without compulsory checksum are composed of self-checking characters. Then, barcode scanner decoders calculate checksums by executing required mathematical operations using the barcode digits that precede the checksum and then verify the calculation result against the checksum value. ![]() 1D barcodes may contain a checksum as an optional property or include it as an obligatory part that is calculated according to the specific algorithm. Usually, a checksum corresponds to the last symbol in a barcode sequence that is encoded as a typical character supported by the corresponding barcode type. Checksums are aimed to ensure that barcode data have not been corrupted or lost and that barcode reading has been performed properly. The concept of checksum (also called check digit) as an error detection mechanism has been introduced to verify the correctness and integrity of information encoded in 1D barcodes.
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