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I keep seeing an ad for a bank's credit card, and in the graphic, the first four digits are a combination lock. but the first four digits encode the card type and issuer. so you could look them up if you looked at the branding on the card. also there's a checksum.Look on archive.org
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it just doesn't work, okay? the advert doesn't make sense if you examine for consistency with credit card number encodings. i think this is a problem.Permalink Look on archive.org