There was a time in the past when some services online wouldn't immediately auth... | Hacker News

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		far33d on Nov 10, 2009 \| parent \| context \| favorite \| on: How Credit Card Numbers Are Generated There was a time in the past when some services online wouldn't immediately authorize the card - it would only check if the value was a "valid" number. So, you could, hypothetically, get 1-3 hours of shell internet access based on a generated number.

eli on Nov 11, 2009 [–]

Wouldn't a "bad" fake (i.e. anything with a valid checksum) work just as well?

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