Validating credit card numbers: The Luhn algorithm Dec22 '05

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# (1 of 2): Josh » joahua.com/blog

36 minutes after the fact. (Thu 22 Dec 2005, 2:15 PM CST)

Wow. That's really cool! Thanks for posting this!

# (2 of 2): Stuart » smkz.is-a-geek.net

1 day, 15 hours after the fact. (Sat 24 Dec 2005, 5:21 AM CST)

That's crazy, cheers for the post. I always thought credit card validation would be a really complex process but that's just simple. I'll keep this post in mind if I ever get a potential client that needs credit card validation on their site.

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It’s interesting how credit card numbers are validated.

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