
A structurally valid USPS barcode can still encode garbage — validating IMb from the bars
Most IMb checks only verify the bars look right. Real validation reverses USPS-B-3200 and recomputes the 11-bit FCS.
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Most IMb checks only verify the bars look right. Real validation reverses USPS-B-3200 and recomputes the 11-bit FCS.

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